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[edit] MyBB Cannot Connect To Database

[edit] Problem

A typical error is as follows:

Warning: mysql_errno(): supplied argument is not a valid MySQL-Link resource in /path/to/forum/inc/db_mysql.php on line 313
MySQL error:
Warning: mysql_error(): supplied argument is not a valid MySQL-Link resource in /path/to/forum/inc/db_mysql.php on line 314

This means MyBB cannot connect to the database. The database connection settings are either incorrect, or the MySQL server is down.

[edit] Resolution

• Make sure that inc/config.php exists, and the database connection settings are correct.
• Contact your webhost if the MySQL server is down (ie. if you try to login to phpMyAdmin and get the same error, then most likely the MySQL server is down).