Mysql authentication issues

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Ever happened to you that you create a user with privileges to connect from any host but it won’t connect from the localhost?

Like this:

[root@18969_1_490528 tmp]# mysql -u test_user -puser_pass
ERROR 1045 (28000): Access denied for user 'test_user'@'localhost' (using password: YES)

[root@18969_1_490528 tmp]# mysql -u test_user -puser_pass -h yourhost.com
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 55
Server version: 5.0.77 Source distribution

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> quit
Bye

The problem are the anonymous users created by mysql_install_db on initial setup of mysql. Those take precedence. So either you create your user both as ‘test_user’@’%’ and ‘test_user’@localhost either erase those users. I erase them like this as I don’t need two set’s of users for every user I need:

mysql> select Host,User from user;
+----------------+--------------+
| Host           | User         |
+----------------+--------------+
| %              | test_user    |
| 127.0.0.1      | root         |
| 18969_1_490528 |              |
| 18969_1_490528 | root         |
| localhost      |              |
| localhost      | root         |
+----------------+--------------+
6 rows in set (0.00 sec)

mysql> delete from user where User='';
Query OK, 2 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

mysql> select Host,User from user;
+----------------+--------------+
| Host           | User         |
+----------------+--------------+
| %              | test_user    |
| 127.0.0.1      | root         |
| 18969_1_490528 | root         |
| localhost      | root         |
+----------------+--------------+
4 rows in set (0.00 sec)

mysql>