mysql replication and GRANT that doesn't quite grant - mysql

Question

I am trying to set up mysql replication. All's well, but I see an error 1045 for the slave:
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: <my.host.ip>
Master_User: slave_user
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 107
Relay_Log_File: mysqld-relay-bin.000003
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Connecting
Slave_SQL_Running: Yes
Replicate_Do_DB: my_db_name
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 107
Relay_Log_Space: 107
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 1045
Last_IO_Error: error connecting to master 'slave_user#my.host.ip:3306' - retry-time: 60 retries: 86400
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
1 row in set (0.00 sec)
mysql>
I try connecting manually, it starts out fine, but I've a permission problem:
$ mysql -h my-host-name -u slave_user -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 46
Server version: 5.5.49-0ubuntu0.14.04.1-log (Ubuntu)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
+--------------------+
1 row in set (0.00 sec)
mysql> use my_db_name;
ERROR 1044 (42000): Access denied for user 'slave_user'#'%.my-domain.com' to database 'my_db_name'
mysql>
But on the master, I created the slave user thus, which seems to be more than adequate:
CREATE USER 'slave_user'#'%.my-domain.com'
IDENTIFIED BY 'changeme';
GRANT REPLICATION SLAVE ON *.* TO 'slave_user'#'%.my-domain.com';
(In passing: I think I would have preferred GRANT REPLICATION SLAVE ON my_db_name.* TO 'slave_user'#'%.my-domain.com';, but that is an error, and I should get this working first.)
mysql> select * from mysql.user where user = 'slave_user'\G
*************************** 1. row ***************************
Host: %.my-domain.com
User: slave_user
Password: *la-de-da-da-nothing-to-see-here-hashed
Select_priv: N
Insert_priv: N
Update_priv: N
Delete_priv: N
Create_priv: N
Drop_priv: N
Reload_priv: N
Shutdown_priv: N
Process_priv: N
File_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Show_db_priv: N
Super_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Execute_priv: N
Repl_slave_priv: Y
Repl_client_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Create_user_priv: N
Event_priv: N
Trigger_priv: N
Create_tablespace_priv: N
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin:
authentication_string: NULL
1 row in set (0.00 sec)
mysql>
Any suggestions?