It all started when I was trying to connect to a VM setup on GCP for SFTP only. Everytime I try to check SSH or setup an SFTP on this machine, it becomes unreachable (and its reachable and well connected on my friend's laptop at the same time).
Ping <ip address>
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
I can ping other VMs and also able to SSH into them.
I thought the problem might be with my router. So I used my phone HOTSPOT to connect to internet and tried again. It still did not work. Moreover to my surprise I got same timeouts when I ping www.google.com (strange, because I am able to use internet through chrome browser).
Other details:
MacBook Pro, High Sierra
Airtel Broadband/ Vodafone (HOTSPOT)
Firewall is off.
Others seem to have faced a similar issue (but I could not find any satisfactory answer in these links):
https://askubuntu.com/questions/608194/have-internet-connection-but-cant-ping-external-sites
Check whether you turned Stealth mode in Settings > Security & Privacy > Firewall.
If it's turned off try turning the whole firewall off, just to test whether that's the culprit.
Related
It appears my GCP Compute Engine service/instance/whatever-you-call-it is refusing connections from my machine at times. I was just trying to set up an SFTP connection through a desktop app and probably failed a password too many times.
But I don't have Fail2Ban installed, and I don't see any Firewall Rules in the GCP interface blocking my IP. During what I perceive as the block, I can't even ping the machine. As soon as I switch to my cellphone's hotspot - I can ping it again. See screenshot below - I switched to the hotspot mid-way in that ping.
Does anyone know where I can look to control this setting and/or see what's being done here?
lastb output reflects regular attempts to get into my machine so I don't understand why something is being so harsh on me while this level of spam is flowing to the Linux level at least.
Found the answer - it's sshguard running on linux.
in /var/log/auth.log
Apr 19 01:43:05 x-x sshguard[696]: Blocking "-.-.-.-/32" for 122880 secs (3 attacks in 1 secs, after 11 abuses over 3268716 secs.)
I'm seeing this problem connecting to most sites when connected to our office LAN.
I'm running a VM (using VMWare Workstation 15 Player) running Win10. The host is also Win10.
Your connection is not secure
The owner of www.google.com has configured their web site improperly. To protect your information from being stolen, Firefox has not connected to this web site.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.
Advanced shows
Error code: SEC_ERROR_UNKNOWN_ISSUER
The network connection is "NAT: Used to share the host's IP address".
I had Avast installed and uninstalled it so ensure it was not blocking the connections.
I do not get this error on the host machine
If I connect the host machine to our corporate VPN or use a Wifi connection, I do not get this error.
The date and time are also correct.
Is there something that VMWare Player is doing to the connection?
Firefox Quantum 65.0.2
Chrome Version 72.0.3626.121
Chrome
Firefox
Apologies for the bad english, i'm french. :D
I've been looking for an answer since approximatively 4 days, and I don't know how to fix my issue.
So:
I want to virtualize two servers using virtualBox on Windows7 and i want them all on the same local network.
My VMs are running on Ubuntu 16.04
On the first VM I installed a lamp web server with MySQL 5.7 and i add phpmyadmin.
On the second VM I installed Jira standalone
--> I need to connect to my Database from my Jira server
So I used the Bridge adapter on each machine:
network configuration
network configuration
Ip adresses are attributed with the DHCP protocol.
The SQL machine ip is 192.168.6.80
The Jira machine ip is 192.168.6.101
The Host machine ip is 192.168.6.87
I'm able to ping each machine so there is no problem.
SQL server
When I start the machine everything seems to work, i can access from my SQL server:
localhost : home page of apache 2 saying "It Works"
localhost:5671 :
[���
5.7.18-0ubuntu0.16.04.1� ���UKBeM�ÿ÷�ÿ����������T(DGKg1hwd=�mysql_native_password���ÿ„Got
packets out of order
localhost/phpmyadmin : the index page where I can connect perfectly with root.
Host Machine (Windows)
192.168.6.80 : home page of apache 2 saying "It Works"
192.168.6.80:5671 :
[���
5.7.18-0ubuntu0.16.04.1� ���UKBeM�ÿ÷�ÿ����������T(DGKg1hwd=�mysql_native_password���ÿ„Got
packets out of order
192.168.6.80/phpmyadmin : the index page where I can connect perfectly with root.
Jira server
Here when i start the machine it works during approximatively 2-3 minutes,
I'am able to connect via:
mysql -u root -p -h 192.168.6.80 -P 5671
I am perfectly connected and i can also access to all the other adresses.
And then it stop working on this machine only.
Unable to connect
Firefox can’t establish a connection to the server at 192.168.6.80.
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
And when i re-try to connect via mysql on terminal I get the Error 2003 (HYOOO)
This happen only when i use the connection of my work, at home it works perfectly without stopping!!
I have few leads:
problems of proxy authentication
problems of firewall configuration
i am in a private network with a domain name called something.eu
And when i launch firefox the proxy shows up automatically:
and-etc-ha.something.eu:9090
So i'm invited to enter my id and password.
My id is : luc.myName#something.eu
After that i'm connected to internet with firefox but not in terminal when i want to use apt.
I search on the web and i found this:
export http_proxy="http://Username:password#proxyip:port/"
and
export http_proxy="http://Domain\user:pasword#proxyip:port/"
So I tried different ways and i was able to download with apt. But the internet connexion with firefox was unstable. But if I use firefox on my host machine the connexion is perfect.
I also tried with settings -> network -> network proxy -> method manual
http: and-etc-ha.something.eu port: 9090
I don't know if I was understandable, tell me!^^
If you have any ideas to help me to solve this problem let me know.
Bye!
I found the cause: In fact there was a ip conflict inside the LAN because the DHCP was giving in-use ip address.
I decide to use the NAT connection with Port Forwarding on VirtualBox.
With that configuration I'm able to access my VMs on my LAN using the host ip address followed by the port of my choice.
I'm running Ubuntu 14.04 when where I give any url even gmail.com it is showing "This Connection is untrusted". Its quite irritating for every website I have to add exception & for few of the website Add exception option is also missing.
Can anyone tell me how to remove this exception from my system.
First of all, don't do any banking or eCommerce through your computer at this time. The errors may actually point at a security hole in your computer.
Now onto debugging. Make sure your computer's date, time, and timezone are setup correctly. An off time could make the certificates invalid by showing that they are expired.
Run nm-tool (you may have to sudo) and look for the DNS entries. Your DNS should point at a server you know. A 192.168.#.# or 10.0.#.# entry is a DNS server running on your private LAN (most likely a router or switch). If the DNS servers are set to something not on your LAN or Google's DNS servers (8.8.8.8 and 8.8.4.4) change them to Google's DNS servers (just to test) by editing /etc/resolvconf/resolv.conf.d/base (with root) and add
nameserver 8.8.8.8
nameserver 8.8.4.4
Now run
sudo resolvconf -u
sudo service network-manager restart
and test if you are still getting SSL certificate issues.
Mozilla
Go to Tools-->Options-->Advanced-->Encryption.
Click on [View Certificates].
Select the "Servers" tab.
Select the exception to delete.
Click [Delete].
I started several GCE instances and was unable to connect to even 1 of them using ssh. For debian wheezy instances the ssh server appeared to be not running ("nc IP 22" times out). Even though I enabled ICMP in default network, debian instances did not respond to ping.
CentOS instances responds to ping and I was able to get an ssh banner using nc intermittently. But connecting using ssh command repeatedly timed out.
I suspected a network outage but "gcutil listzones" showed that all the zones I was using, were UP (us-cental)
From https://groups.google.com/d/msg/gce-operations/coBWszq91j4/dRPq5_gJ3t4J:
We're investigating an issue with network connectivity to new Google Compute Engine instances. Currently-running instances are not affected. We will provide more information shortly.