unable to reset mysql 'root' password - mysql

I have installed mysql 5.7.18. After installation the password of root user is null.
I have tried mysql_secure_instattation and following queries to reset ther password.
ALTER USER 'root'#'localhost' IDENTIFIED BY 'MyPassword';
and
UPDATE mysql.user
SET authentication_string = PASSWORD('MyPassword'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
FLUSH PRIVILEGES;
These methods executed successfully but still mysql root user is connecting NULL password.
What should I do ?


Forse stopping the server: if it is running as a service, use the task manager. (or with services)
Create a file C:\mysql-init.txt (for example) where you type:
ALTER USER 'root'#'localhost' IDENTIFIED BY 'MyNewPass';
Open the cmd (as administrator) and run this:
C:\> cd "C:\Program Files\MySQL\MySQL Server 5.7\bin"
C:\> mysqld --init-file=C:\\mysql-init.txt
NOTE: if you are working with MySQL 5.7.5 and earlier, change the command line with this one:
SET PASSWORD FOR 'root'#'localhost' = PASSWORD('MyNewPass');


You can update your MySQL password with the following command too:
mysqladmin -u root -p'oldpassword' password newpass


This is due to,MySQL is using unix_socket plugin instead of mysql_native_password plugin for root user which means mysql trusts the credentials of Linux root user. If you are loggied in with linux root user, MySQL won't ask for saperate credentials for MySQL root user. Hence even after changing password successfully for MySQL root user, it was connecting with No password.

Related

MySql -u root -p not working on new computer [duplicate]

I'm trying to run WordPress in my Windows desktop and it needs MySQL.
I install everything with Web Platform Installer which is provided by Microsoft. I never set a root password for MySQL and in the final step of installing WordPress, it asks for a MySQL server password.
What is the default password for root (if there is one) and how to change it?
I tried:
mysql -u root password '123'
But it shows me:
Access denied for user 'root#localhost' (using password:NO)
After this I try:
mysql -u root -p
However, it asks for a password which I don't have.
Update: as Bozho suggested, I did the following:
I stopped the MySQL Service from Windows services
Opened CMD
Changed the location to c:\program files\mysql\bin
Executed the command below
mysqld --defaults-file="C:\\program files\\mysql\\mysql server 5.1\\my.ini" --init-files=C:\\root.txt
The command ran with a warning about character set which I mentioned below
I start the MySQL service from Windows services
I write in the command line
mysql -u root -p
EnterPassword: 123 // 123 was the password
The command line shows the following error
Access denied for user 'root#localhost' (using password:**YES**)
How do I solve this?

for this kind of error; you just have to set new password to the root user as an admin. follow the steps as follows:
[root ~]# mysql -u root
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password:NO)
Stop the service/daemon of mysql running
[root ~]# service mysql stop
mysql stop/waiting
Start mysql without any privileges using the following option;
This option is used to boot up and do not use the privilege system of MySQL.
[root ~]# mysqld_safe --skip-grant-tables &
At this moment, the terminal will seem to halt. Let that be, and use new terminal for next steps.
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the root user ;
mysql> use mysql;
Database changed
mysql> select * from user;
Empty set (0.00 sec)
mysql> truncate table user;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> grant all privileges on *.* to root#localhost identified by 'YourNewPassword' with grant option;
Query OK, 0 rows affected (0.01 sec)
*if you don`t want any password or rather an empty password
mysql> grant all privileges on *.* to root#localhost identified by '' with grant option;
Query OK, 0 rows affected (0.01 sec)*
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
Confirm the results:
mysql> select host, user from user;
+-----------+------+
| host | user |
+-----------+------+
| localhost | root |
+-----------+------+
1 row in set (0.00 sec)
Exit the shell and restart mysql in normal mode.
mysql> quit;
[root ~]# kill -KILL [PID of mysqld_safe]
[root ~]# kill -KILL [PID of mysqld]
[root ~]# service mysql start
Now you can successfully login as root user with the password you set
[root ~]# mysql -u root -pYourNewPassword
mysql>

You can reset your root password. Have in mind that it is not advisable to use root without password.

1) You can set root password by invoking MySQL console. It is located in
C:\wamp\bin\mysql\mysql5.1.53\bin by default.
Get to the directory and type MySQL. then set the password as follows..
> SET PASSWORD FOR root#localhost = PASSWORD('new-password');
2) You can configure wamp's phpmyadmin application for root user by editing
C:\wamp\apps\phpmyadmin3.3.9\config.inc.php
Note :- if you are using xampp then , file will be located at
C:\xampp\phpMyadmin\config.inc.php
It looks like this:
$cfg['Servers'][$i]['verbose'] = 'localhost';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'YOURPASSWORD';
$cfg['Servers'][$i]['AllowNoPassword'] = false;
The error "Access denied for user 'root#localhost' (using password:NO)"
will be resolved when you set $cfg['Servers'][$i]['AllowNoPassword'] to false
If you priviously changed the password for 'root#localhost', then you have to do 2 things to solve the error "Access denided for user 'root#localhost'":
if ['password'] have a empty quotes like ' ' then put your password between quotes.
change the (using password:NO) to (using password:YES)
This will resolve the error.
Note: phpmyadmin is a separate tool which comes with wamp.
It just provide a interface to MySQL. if you change my sql root's password, then you should change the phpmyadmin configurations. Usually phpmyadmin is configured to root user.

Use mysql -u root -p
It will ask for password, insert password and enter.

I was getting the same error on OS X El captain.
Mysql version 5.7 . I was able to connect to mysql with root after executing these steps.
Stop the mysql server
sudo mysql.server stop
Start mysql in safe mode
sudo mysqld_safe --skip-grant-tables
Using mysqld, Change the database to mysql and update the details for user 'root'.
show databases;
use mysql;
UPDATE mysql.user
SET authentication_string = PASSWORD('MyNewPass'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
exit;
After that kill the 'mysqld_safe' process and start mysql normally. You should be able to login to mysql using root and new password. SQL docs for more details

Simply edit my.ini file in C:\xampp\mysql\bin path. Just add:
skip-grant-tables
line in between lines of # The MySQL server [mysqld] and port=3306. Then restart the MySQL server.
Looks like:

For some information I've get error after changing password:
Access denied for user 'root'#'localhost' (using password: NO)
Access denied for user 'root'#'localhost' (using password: YES)
In both cases there was error.
But the thing is after that I've tried it with
mysql -uroot -ppassword instead of
mysql -u root -p password -> with spaces between -uroot and -ppassword so maybe if someone get trouble can try this way.

Make sure the MySQL service is running on your machine, then follow the instructions from MySQL for initially setting up root (search for 'windows' and it will take you to the steps for setting up root):
Securing the Initial MySQL Account

Another solution if someone gets the error The specified password for user account ‘root’ is not valid, or failed to connect to the database server also with the right password, is the follow
•In the Windows registry, delete the mysql_pwd reg key under HKCU\Software\Microsoft\WebPlatformInstaller
•Unistall older version of MySQL .NET connector
•Download and install the latest MySql .NET Connector.

Change the password from config.inc.php present in C:\xampp\phpMyAdmin.
Type mysql -u root -p in the command prompt.
You will be asked to enter the password. Enter that password which you updated in the config.inc.php.

In your code replace the 'root' with your Server username and password with your server password.
For example if you have DB and your php files on the server http://www.example.com
then obviously you would have to enter into this server site using your username and password.

For MySQL 5.7. These are the below steps:
Stop your MySQL server completely. This can be done by accessing the Services window inside Windows XP and Windows Server 2003, where you can stop the MySQL service.
Open your MS-DOS command prompt using "cmd" inside the Run window. Inside it navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Execute the following command in the command prompt: mysqld.exe -u root --skip-grant-tables
Leave the current MS-DOS command prompt as it is, and open a new MS-DOS command prompt window.
Navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Enter mysql and press enter.
You should now have the MySQL command prompt working. Type use mysql; so that we switch to the "mysql" database.
Execute the following command to update the password:
update user set authentication_string=password('1111') where user='root';

Some times it just happens due to installation of Wamp or changing of password options of root user.
One can use privilages-->root (user) and then set password option to NO to run the things without any password OR set the password and use it in the application.

If you are using XAMPP just go to C:\xampp\phpMyAdmin and then open config.inc.php find $cfg['Servers'][$i]['password'] = '' line and put your password there.

if you changed the port to non standard one, then you need to specify it:
$connection = mysqli_connect('localhost:3308', 'root', '', 'loginapp');

If the root account exists but has no password, connect to the server as root using no password, then assign a password. This was my situation when I encountered this issue.
Connect to the server as root using no password:
$> mysql -u root --skip-password
Assign a password:
mysql> ALTER USER 'root'#'localhost' IDENTIFIED BY 'root-password';
I was able to solve my problem this way. Hope this helps someone who encounters a similar issue in the future. Cheers!
Reference: https://dev.mysql.com/doc/refman/8.0/en/default-privileges.html

mysqladmin -u root -p password
enter your current password
then
enter your new password

It happens because of the security reason.
try with the following
mysql -u root -p
click enter and enter the password and try again

How to change MySQL root password via a file?

How do I change the MySQL root password in ubuntu server via a file?
The file may be any shell script or normal text file.
My try:
Normally the below command, in the terminal, changes the password for newly installed mysql.
mysqladmin -u root password 'newpass'
But while doing it via file it's showing the bellow error.
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'#'localhost' (using password: NO)'
So can someone help me to do so.

Stop the MySQL Server: sudo /etc/init.d/mysql stop
Start the mysqld configuration: sudo mysqld --skip-grant-tables
Login to MySQL as root: mysql -u root mysql
Replace YOURNEWPASSWORD with your new password:
UPDATE
mysql.user
SET
Password = PASSWORD('YOURNEWPASSWORD')
WHERE
User = 'root';
FLUSH PRIVILEGES;
exit;
Note: This method is not regarded as the most secure way of resetting the password, however, it works.

If you have never assigned a root password for MySQL, the server does not require a password at all for connecting as root follow :
Resetting Permissions

mysql error : ERROR 1045 (28000): Access denied for user [duplicate]

I'm trying to run WordPress in my Windows desktop and it needs MySQL.
I install everything with Web Platform Installer which is provided by Microsoft. I never set a root password for MySQL and in the final step of installing WordPress, it asks for a MySQL server password.
What is the default password for root (if there is one) and how to change it?
I tried:
mysql -u root password '123'
But it shows me:
Access denied for user 'root#localhost' (using password:NO)
After this I try:
mysql -u root -p
However, it asks for a password which I don't have.
Update: as Bozho suggested, I did the following:
I stopped the MySQL Service from Windows services
Opened CMD
Changed the location to c:\program files\mysql\bin
Executed the command below
mysqld --defaults-file="C:\\program files\\mysql\\mysql server 5.1\\my.ini" --init-files=C:\\root.txt
The command ran with a warning about character set which I mentioned below
I start the MySQL service from Windows services
I write in the command line
mysql -u root -p
EnterPassword: 123 // 123 was the password
The command line shows the following error
Access denied for user 'root#localhost' (using password:**YES**)
How do I solve this?

for this kind of error; you just have to set new password to the root user as an admin. follow the steps as follows:
[root ~]# mysql -u root
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password:NO)
Stop the service/daemon of mysql running
[root ~]# service mysql stop
mysql stop/waiting
Start mysql without any privileges using the following option;
This option is used to boot up and do not use the privilege system of MySQL.
[root ~]# mysqld_safe --skip-grant-tables &
At this moment, the terminal will seem to halt. Let that be, and use new terminal for next steps.
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the root user ;
mysql> use mysql;
Database changed
mysql> select * from user;
Empty set (0.00 sec)
mysql> truncate table user;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> grant all privileges on *.* to root#localhost identified by 'YourNewPassword' with grant option;
Query OK, 0 rows affected (0.01 sec)
*if you don`t want any password or rather an empty password
mysql> grant all privileges on *.* to root#localhost identified by '' with grant option;
Query OK, 0 rows affected (0.01 sec)*
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
Confirm the results:
mysql> select host, user from user;
+-----------+------+
| host | user |
+-----------+------+
| localhost | root |
+-----------+------+
1 row in set (0.00 sec)
Exit the shell and restart mysql in normal mode.
mysql> quit;
[root ~]# kill -KILL [PID of mysqld_safe]
[root ~]# kill -KILL [PID of mysqld]
[root ~]# service mysql start
Now you can successfully login as root user with the password you set
[root ~]# mysql -u root -pYourNewPassword
mysql>

You can reset your root password. Have in mind that it is not advisable to use root without password.

1) You can set root password by invoking MySQL console. It is located in
C:\wamp\bin\mysql\mysql5.1.53\bin by default.
Get to the directory and type MySQL. then set the password as follows..
> SET PASSWORD FOR root#localhost = PASSWORD('new-password');
2) You can configure wamp's phpmyadmin application for root user by editing
C:\wamp\apps\phpmyadmin3.3.9\config.inc.php
Note :- if you are using xampp then , file will be located at
C:\xampp\phpMyadmin\config.inc.php
It looks like this:
$cfg['Servers'][$i]['verbose'] = 'localhost';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'YOURPASSWORD';
$cfg['Servers'][$i]['AllowNoPassword'] = false;
The error "Access denied for user 'root#localhost' (using password:NO)"
will be resolved when you set $cfg['Servers'][$i]['AllowNoPassword'] to false
If you priviously changed the password for 'root#localhost', then you have to do 2 things to solve the error "Access denided for user 'root#localhost'":
if ['password'] have a empty quotes like ' ' then put your password between quotes.
change the (using password:NO) to (using password:YES)
This will resolve the error.
Note: phpmyadmin is a separate tool which comes with wamp.
It just provide a interface to MySQL. if you change my sql root's password, then you should change the phpmyadmin configurations. Usually phpmyadmin is configured to root user.

Use mysql -u root -p
It will ask for password, insert password and enter.

I was getting the same error on OS X El captain.
Mysql version 5.7 . I was able to connect to mysql with root after executing these steps.
Stop the mysql server
sudo mysql.server stop
Start mysql in safe mode
sudo mysqld_safe --skip-grant-tables
Using mysqld, Change the database to mysql and update the details for user 'root'.
show databases;
use mysql;
UPDATE mysql.user
SET authentication_string = PASSWORD('MyNewPass'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
exit;
After that kill the 'mysqld_safe' process and start mysql normally. You should be able to login to mysql using root and new password. SQL docs for more details

Simply edit my.ini file in C:\xampp\mysql\bin path. Just add:
skip-grant-tables
line in between lines of # The MySQL server [mysqld] and port=3306. Then restart the MySQL server.
Looks like:

For some information I've get error after changing password:
Access denied for user 'root'#'localhost' (using password: NO)
Access denied for user 'root'#'localhost' (using password: YES)
In both cases there was error.
But the thing is after that I've tried it with
mysql -uroot -ppassword instead of
mysql -u root -p password -> with spaces between -uroot and -ppassword so maybe if someone get trouble can try this way.

Make sure the MySQL service is running on your machine, then follow the instructions from MySQL for initially setting up root (search for 'windows' and it will take you to the steps for setting up root):
Securing the Initial MySQL Account

Another solution if someone gets the error The specified password for user account ‘root’ is not valid, or failed to connect to the database server also with the right password, is the follow
•In the Windows registry, delete the mysql_pwd reg key under HKCU\Software\Microsoft\WebPlatformInstaller
•Unistall older version of MySQL .NET connector
•Download and install the latest MySql .NET Connector.

Change the password from config.inc.php present in C:\xampp\phpMyAdmin.
Type mysql -u root -p in the command prompt.
You will be asked to enter the password. Enter that password which you updated in the config.inc.php.

In your code replace the 'root' with your Server username and password with your server password.
For example if you have DB and your php files on the server http://www.example.com
then obviously you would have to enter into this server site using your username and password.

For MySQL 5.7. These are the below steps:
Stop your MySQL server completely. This can be done by accessing the Services window inside Windows XP and Windows Server 2003, where you can stop the MySQL service.
Open your MS-DOS command prompt using "cmd" inside the Run window. Inside it navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Execute the following command in the command prompt: mysqld.exe -u root --skip-grant-tables
Leave the current MS-DOS command prompt as it is, and open a new MS-DOS command prompt window.
Navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Enter mysql and press enter.
You should now have the MySQL command prompt working. Type use mysql; so that we switch to the "mysql" database.
Execute the following command to update the password:
update user set authentication_string=password('1111') where user='root';

Some times it just happens due to installation of Wamp or changing of password options of root user.
One can use privilages-->root (user) and then set password option to NO to run the things without any password OR set the password and use it in the application.

If you are using XAMPP just go to C:\xampp\phpMyAdmin and then open config.inc.php find $cfg['Servers'][$i]['password'] = '' line and put your password there.

if you changed the port to non standard one, then you need to specify it:
$connection = mysqli_connect('localhost:3308', 'root', '', 'loginapp');

If the root account exists but has no password, connect to the server as root using no password, then assign a password. This was my situation when I encountered this issue.
Connect to the server as root using no password:
$> mysql -u root --skip-password
Assign a password:
mysql> ALTER USER 'root'#'localhost' IDENTIFIED BY 'root-password';
I was able to solve my problem this way. Hope this helps someone who encounters a similar issue in the future. Cheers!
Reference: https://dev.mysql.com/doc/refman/8.0/en/default-privileges.html

mysqladmin -u root -p password
enter your current password
then
enter your new password

It happens because of the security reason.
try with the following
mysql -u root -p
click enter and enter the password and try again

Get error Access denied for user 'root'#'localhost' (using password: NO) when setting Wordpress on amazon ec2 [duplicate]

I'm trying to run WordPress in my Windows desktop and it needs MySQL.
I install everything with Web Platform Installer which is provided by Microsoft. I never set a root password for MySQL and in the final step of installing WordPress, it asks for a MySQL server password.
What is the default password for root (if there is one) and how to change it?
I tried:
mysql -u root password '123'
But it shows me:
Access denied for user 'root#localhost' (using password:NO)
After this I try:
mysql -u root -p
However, it asks for a password which I don't have.
Update: as Bozho suggested, I did the following:
I stopped the MySQL Service from Windows services
Opened CMD
Changed the location to c:\program files\mysql\bin
Executed the command below
mysqld --defaults-file="C:\\program files\\mysql\\mysql server 5.1\\my.ini" --init-files=C:\\root.txt
The command ran with a warning about character set which I mentioned below
I start the MySQL service from Windows services
I write in the command line
mysql -u root -p
EnterPassword: 123 // 123 was the password
The command line shows the following error
Access denied for user 'root#localhost' (using password:**YES**)
How do I solve this?

for this kind of error; you just have to set new password to the root user as an admin. follow the steps as follows:
[root ~]# mysql -u root
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password:NO)
Stop the service/daemon of mysql running
[root ~]# service mysql stop
mysql stop/waiting
Start mysql without any privileges using the following option;
This option is used to boot up and do not use the privilege system of MySQL.
[root ~]# mysqld_safe --skip-grant-tables &
At this moment, the terminal will seem to halt. Let that be, and use new terminal for next steps.
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the root user ;
mysql> use mysql;
Database changed
mysql> select * from user;
Empty set (0.00 sec)
mysql> truncate table user;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> grant all privileges on *.* to root#localhost identified by 'YourNewPassword' with grant option;
Query OK, 0 rows affected (0.01 sec)
*if you don`t want any password or rather an empty password
mysql> grant all privileges on *.* to root#localhost identified by '' with grant option;
Query OK, 0 rows affected (0.01 sec)*
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
Confirm the results:
mysql> select host, user from user;
+-----------+------+
| host | user |
+-----------+------+
| localhost | root |
+-----------+------+
1 row in set (0.00 sec)
Exit the shell and restart mysql in normal mode.
mysql> quit;
[root ~]# kill -KILL [PID of mysqld_safe]
[root ~]# kill -KILL [PID of mysqld]
[root ~]# service mysql start
Now you can successfully login as root user with the password you set
[root ~]# mysql -u root -pYourNewPassword
mysql>

You can reset your root password. Have in mind that it is not advisable to use root without password.

1) You can set root password by invoking MySQL console. It is located in
C:\wamp\bin\mysql\mysql5.1.53\bin by default.
Get to the directory and type MySQL. then set the password as follows..
> SET PASSWORD FOR root#localhost = PASSWORD('new-password');
2) You can configure wamp's phpmyadmin application for root user by editing
C:\wamp\apps\phpmyadmin3.3.9\config.inc.php
Note :- if you are using xampp then , file will be located at
C:\xampp\phpMyadmin\config.inc.php
It looks like this:
$cfg['Servers'][$i]['verbose'] = 'localhost';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'YOURPASSWORD';
$cfg['Servers'][$i]['AllowNoPassword'] = false;
The error "Access denied for user 'root#localhost' (using password:NO)"
will be resolved when you set $cfg['Servers'][$i]['AllowNoPassword'] to false
If you priviously changed the password for 'root#localhost', then you have to do 2 things to solve the error "Access denided for user 'root#localhost'":
if ['password'] have a empty quotes like ' ' then put your password between quotes.
change the (using password:NO) to (using password:YES)
This will resolve the error.
Note: phpmyadmin is a separate tool which comes with wamp.
It just provide a interface to MySQL. if you change my sql root's password, then you should change the phpmyadmin configurations. Usually phpmyadmin is configured to root user.

Use mysql -u root -p
It will ask for password, insert password and enter.

I was getting the same error on OS X El captain.
Mysql version 5.7 . I was able to connect to mysql with root after executing these steps.
Stop the mysql server
sudo mysql.server stop
Start mysql in safe mode
sudo mysqld_safe --skip-grant-tables
Using mysqld, Change the database to mysql and update the details for user 'root'.
show databases;
use mysql;
UPDATE mysql.user
SET authentication_string = PASSWORD('MyNewPass'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
exit;
After that kill the 'mysqld_safe' process and start mysql normally. You should be able to login to mysql using root and new password. SQL docs for more details

Simply edit my.ini file in C:\xampp\mysql\bin path. Just add:
skip-grant-tables
line in between lines of # The MySQL server [mysqld] and port=3306. Then restart the MySQL server.
Looks like:

For some information I've get error after changing password:
Access denied for user 'root'#'localhost' (using password: NO)
Access denied for user 'root'#'localhost' (using password: YES)
In both cases there was error.
But the thing is after that I've tried it with
mysql -uroot -ppassword instead of
mysql -u root -p password -> with spaces between -uroot and -ppassword so maybe if someone get trouble can try this way.

Make sure the MySQL service is running on your machine, then follow the instructions from MySQL for initially setting up root (search for 'windows' and it will take you to the steps for setting up root):
Securing the Initial MySQL Account

Another solution if someone gets the error The specified password for user account ‘root’ is not valid, or failed to connect to the database server also with the right password, is the follow
•In the Windows registry, delete the mysql_pwd reg key under HKCU\Software\Microsoft\WebPlatformInstaller
•Unistall older version of MySQL .NET connector
•Download and install the latest MySql .NET Connector.

Change the password from config.inc.php present in C:\xampp\phpMyAdmin.
Type mysql -u root -p in the command prompt.
You will be asked to enter the password. Enter that password which you updated in the config.inc.php.

In your code replace the 'root' with your Server username and password with your server password.
For example if you have DB and your php files on the server http://www.example.com
then obviously you would have to enter into this server site using your username and password.

For MySQL 5.7. These are the below steps:
Stop your MySQL server completely. This can be done by accessing the Services window inside Windows XP and Windows Server 2003, where you can stop the MySQL service.
Open your MS-DOS command prompt using "cmd" inside the Run window. Inside it navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Execute the following command in the command prompt: mysqld.exe -u root --skip-grant-tables
Leave the current MS-DOS command prompt as it is, and open a new MS-DOS command prompt window.
Navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Enter mysql and press enter.
You should now have the MySQL command prompt working. Type use mysql; so that we switch to the "mysql" database.
Execute the following command to update the password:
update user set authentication_string=password('1111') where user='root';

Some times it just happens due to installation of Wamp or changing of password options of root user.
One can use privilages-->root (user) and then set password option to NO to run the things without any password OR set the password and use it in the application.

If you are using XAMPP just go to C:\xampp\phpMyAdmin and then open config.inc.php find $cfg['Servers'][$i]['password'] = '' line and put your password there.

if you changed the port to non standard one, then you need to specify it:
$connection = mysqli_connect('localhost:3308', 'root', '', 'loginapp');

If the root account exists but has no password, connect to the server as root using no password, then assign a password. This was my situation when I encountered this issue.
Connect to the server as root using no password:
$> mysql -u root --skip-password
Assign a password:
mysql> ALTER USER 'root'#'localhost' IDENTIFIED BY 'root-password';
I was able to solve my problem this way. Hope this helps someone who encounters a similar issue in the future. Cheers!
Reference: https://dev.mysql.com/doc/refman/8.0/en/default-privileges.html

mysqladmin -u root -p password
enter your current password
then
enter your new password

It happens because of the security reason.
try with the following
mysql -u root -p
click enter and enter the password and try again

Access denied for user 'root#localhost' (using password:NO)

I'm trying to run WordPress in my Windows desktop and it needs MySQL.
I install everything with Web Platform Installer which is provided by Microsoft. I never set a root password for MySQL and in the final step of installing WordPress, it asks for a MySQL server password.
What is the default password for root (if there is one) and how to change it?
I tried:
mysql -u root password '123'
But it shows me:
Access denied for user 'root#localhost' (using password:NO)
After this I try:
mysql -u root -p
However, it asks for a password which I don't have.
Update: as Bozho suggested, I did the following:
I stopped the MySQL Service from Windows services
Opened CMD
Changed the location to c:\program files\mysql\bin
Executed the command below
mysqld --defaults-file="C:\\program files\\mysql\\mysql server 5.1\\my.ini" --init-files=C:\\root.txt
The command ran with a warning about character set which I mentioned below
I start the MySQL service from Windows services
I write in the command line
mysql -u root -p
EnterPassword: 123 // 123 was the password
The command line shows the following error
Access denied for user 'root#localhost' (using password:**YES**)
How do I solve this?

for this kind of error; you just have to set new password to the root user as an admin. follow the steps as follows:
[root ~]# mysql -u root
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password:NO)
Stop the service/daemon of mysql running
[root ~]# service mysql stop
mysql stop/waiting
Start mysql without any privileges using the following option;
This option is used to boot up and do not use the privilege system of MySQL.
[root ~]# mysqld_safe --skip-grant-tables &
At this moment, the terminal will seem to halt. Let that be, and use new terminal for next steps.
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the root user ;
mysql> use mysql;
Database changed
mysql> select * from user;
Empty set (0.00 sec)
mysql> truncate table user;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> grant all privileges on *.* to root#localhost identified by 'YourNewPassword' with grant option;
Query OK, 0 rows affected (0.01 sec)
*if you don`t want any password or rather an empty password
mysql> grant all privileges on *.* to root#localhost identified by '' with grant option;
Query OK, 0 rows affected (0.01 sec)*
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
Confirm the results:
mysql> select host, user from user;
+-----------+------+
| host | user |
+-----------+------+
| localhost | root |
+-----------+------+
1 row in set (0.00 sec)
Exit the shell and restart mysql in normal mode.
mysql> quit;
[root ~]# kill -KILL [PID of mysqld_safe]
[root ~]# kill -KILL [PID of mysqld]
[root ~]# service mysql start
Now you can successfully login as root user with the password you set
[root ~]# mysql -u root -pYourNewPassword
mysql>

You can reset your root password. Have in mind that it is not advisable to use root without password.

1) You can set root password by invoking MySQL console. It is located in
C:\wamp\bin\mysql\mysql5.1.53\bin by default.
Get to the directory and type MySQL. then set the password as follows..
> SET PASSWORD FOR root#localhost = PASSWORD('new-password');
2) You can configure wamp's phpmyadmin application for root user by editing
C:\wamp\apps\phpmyadmin3.3.9\config.inc.php
Note :- if you are using xampp then , file will be located at
C:\xampp\phpMyadmin\config.inc.php
It looks like this:
$cfg['Servers'][$i]['verbose'] = 'localhost';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'YOURPASSWORD';
$cfg['Servers'][$i]['AllowNoPassword'] = false;
The error "Access denied for user 'root#localhost' (using password:NO)"
will be resolved when you set $cfg['Servers'][$i]['AllowNoPassword'] to false
If you priviously changed the password for 'root#localhost', then you have to do 2 things to solve the error "Access denided for user 'root#localhost'":
if ['password'] have a empty quotes like ' ' then put your password between quotes.
change the (using password:NO) to (using password:YES)
This will resolve the error.
Note: phpmyadmin is a separate tool which comes with wamp.
It just provide a interface to MySQL. if you change my sql root's password, then you should change the phpmyadmin configurations. Usually phpmyadmin is configured to root user.

Use mysql -u root -p
It will ask for password, insert password and enter.

I was getting the same error on OS X El captain.
Mysql version 5.7 . I was able to connect to mysql with root after executing these steps.
Stop the mysql server
sudo mysql.server stop
Start mysql in safe mode
sudo mysqld_safe --skip-grant-tables
Using mysqld, Change the database to mysql and update the details for user 'root'.
show databases;
use mysql;
UPDATE mysql.user
SET authentication_string = PASSWORD('MyNewPass'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
exit;
After that kill the 'mysqld_safe' process and start mysql normally. You should be able to login to mysql using root and new password. SQL docs for more details

Simply edit my.ini file in C:\xampp\mysql\bin path. Just add:
skip-grant-tables
line in between lines of # The MySQL server [mysqld] and port=3306. Then restart the MySQL server.
Looks like:

For some information I've get error after changing password:
Access denied for user 'root'#'localhost' (using password: NO)
Access denied for user 'root'#'localhost' (using password: YES)
In both cases there was error.
But the thing is after that I've tried it with
mysql -uroot -ppassword instead of
mysql -u root -p password -> with spaces between -uroot and -ppassword so maybe if someone get trouble can try this way.

Make sure the MySQL service is running on your machine, then follow the instructions from MySQL for initially setting up root (search for 'windows' and it will take you to the steps for setting up root):
Securing the Initial MySQL Account

Another solution if someone gets the error The specified password for user account ‘root’ is not valid, or failed to connect to the database server also with the right password, is the follow
•In the Windows registry, delete the mysql_pwd reg key under HKCU\Software\Microsoft\WebPlatformInstaller
•Unistall older version of MySQL .NET connector
•Download and install the latest MySql .NET Connector.

Change the password from config.inc.php present in C:\xampp\phpMyAdmin.
Type mysql -u root -p in the command prompt.
You will be asked to enter the password. Enter that password which you updated in the config.inc.php.

In your code replace the 'root' with your Server username and password with your server password.
For example if you have DB and your php files on the server http://www.example.com
then obviously you would have to enter into this server site using your username and password.

For MySQL 5.7. These are the below steps:
Stop your MySQL server completely. This can be done by accessing the Services window inside Windows XP and Windows Server 2003, where you can stop the MySQL service.
Open your MS-DOS command prompt using "cmd" inside the Run window. Inside it navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Execute the following command in the command prompt: mysqld.exe -u root --skip-grant-tables
Leave the current MS-DOS command prompt as it is, and open a new MS-DOS command prompt window.
Navigate to your MySQL bin folder, such as C:\MySQL\bin using the cd command.
Enter mysql and press enter.
You should now have the MySQL command prompt working. Type use mysql; so that we switch to the "mysql" database.
Execute the following command to update the password:
update user set authentication_string=password('1111') where user='root';

Some times it just happens due to installation of Wamp or changing of password options of root user.
One can use privilages-->root (user) and then set password option to NO to run the things without any password OR set the password and use it in the application.

If you are using XAMPP just go to C:\xampp\phpMyAdmin and then open config.inc.php find $cfg['Servers'][$i]['password'] = '' line and put your password there.

if you changed the port to non standard one, then you need to specify it:
$connection = mysqli_connect('localhost:3308', 'root', '', 'loginapp');

If the root account exists but has no password, connect to the server as root using no password, then assign a password. This was my situation when I encountered this issue.
Connect to the server as root using no password:
$> mysql -u root --skip-password
Assign a password:
mysql> ALTER USER 'root'#'localhost' IDENTIFIED BY 'root-password';
I was able to solve my problem this way. Hope this helps someone who encounters a similar issue in the future. Cheers!
Reference: https://dev.mysql.com/doc/refman/8.0/en/default-privileges.html

mysqladmin -u root -p password
enter your current password
then
enter your new password

It happens because of the security reason.
try with the following
mysql -u root -p
click enter and enter the password and try again