What does this MySQL errors mean?

[kau]

Database error in vBulletin :

Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (13)

mysql error number: 2002

Also how do I fix it?

[daemon]

Database error in vBulletin :

Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (13)

mysql error number: 2002

Also how do I fix it?

It means that vBulletin couldn't connect to your mySQL installation. Make sure that:

(1) You've entered the proper values into includes/config.php
(2) You've renamed includes/config.php.new to includes/config.php
(3) Your mySQL server is running (you can check by launching phpMyAdmin)

[Steve Machol]

This error means either MySQL crashed, it's not running or it can't find the socket. You need to contact your host about this. Here is more info on this error:

http://www.mysql.com/doc/C/a/Can_not_connect_to_server.html