mysql_connect error in VB

[Bellsy]

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Unknown MySQL server host 'p50mysql333.secureserver.net' (1)
/home/content/b/e/l/bellsy4139/html/ThePenShop/includes/class_core.php on line 311

MySQL Error :
Error Number :
Request Date : Sunday, November 18th 2012 @ 03:14:05 AM
Error Date : Sunday, November 18th 2012 @ 03:14:05 AM
Script : http://www.thepenshop.net/ajax.php
Referrer : http://www.thepenshop.net/index.php
IP Address : 65.93.146.10
Username :
Classname : vB_Database
MySQL Version :

Currently running Version 3.8.7

I have been getting emails today with similar error messages as posted above. This error problem started this morning with this error above being the first and during the rest of the day I have had another 12 errors since.

No idea where to even start looking to fix it?

No updates have been added to the site in quite some time. A site back up was done # 21 days ago. It's just been business as usual until today.

Thanks

--------------- Added [DATE]1353300053[/DATE] at [TIME]1353300053[/TIME] ---------------

I searched the site and none of the error message IP's belong to registered users. Some of the error message do come from repeat IP's.