Este es el top five de los errores mas comunes durante el proceso de conexión al servidor de base de datos MySQL.

1. 2003 Can't connect to MySQL server on.
http://forums.sqlplex.com/mentat-technologies-database-tools/category-dreamcoder-for-mysql/cant-connect-to-mysql-server.html

2. Lost connection to MySQL server during query.
http://forums.sqlplex.com/mentat-technologies-database-tools/category-dreamcoder-for-mysql/lost-connection-to-mysql-server-during-query.html

3. 1045 Access denied for user.
http://forums.sqlplex.com/mentat-technologies-database-tools/category-dreamcoder-for-mysql/access-denied-for-user.html

4. Host xxx is not allowed to connect to this MySQL.
http://forums.sqlplex.com/mentat-technologies-database-tools/category-dreamcoder-for-mysql/host-is-not-allowed-to-connect-to-this-mysql.html

5. MySQL server has gone away.
http://forums.sqlplex.com/mentat-technologies-database-tools/category-dreamcoder-for-mysql/mysql-server-has-gone-away.html

Para mas información revisar la documentación de MySQL: