Database Error - Can't connect to local MySQL server through socket.

[smooth-c]

Okay. Here's the low-down - My forum has been on hiatus for around 3 weeks or so. I haven't changed any mods, added any new mods or changed any settings - re-opening, I'm now getting these errors and it's driving me crazy.

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/tmp/mysql5.sock' (111)
/homepages/29/d355849155/htdocs/discussion/includes/class_core.php on line 314

MySQL Error   :
Error Number  :
Request Date  : Sunday, April 17th 2011 @ 04:58:52 AM
Error Date    : Sunday, April 17th 2011 @ 04:58:52 AM
Script        : http://www.xx.com/discussion/external.php?type=RSS2&forumids=2
Referrer      :
IP Address    : 82.245.125.153
Username      :
Classname     : vB_Database
MySQL Version :

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/tmp/mysql5.sock' (111)
/homepages/29/d355849155/htdocs/discussion/includes/class_core.php on line 314

MySQL Error   :
Error Number  :
Request Date  : Sunday, April 17th 2011 @ 04:58:52 AM
Error Date    : Sunday, April 17th 2011 @ 04:58:52 AM
Script        : http://www.xx.com/discussion/forumdisplay.php?49-Smooth-Criminal/page3&order=desc
Referrer      :
IP Address    : 66.249.71.112
Username      :
Classname     : vB_Database
MySQL Version :

As you can see, it seems to be just about any script that it errors on. I have about 60 odd emails just through the night with different errors.

I run vBulletin on a 1and1 managed server. I followed the instructions on here;

https://vborg.vbsupport.ru/showthread.php?t=206682

Scroll to the very bottom;

1) I run PhP as a module.

2) I change the follow lines on config.php to be like this:
$config['MasterServer']['servername'] = 'localhost';
$config['MasterServer']['port'] = '/tmp/mysql5.sock';

3) I add the follow lines on the .htaccess on the vb4.x directory:

php_value mysql.default_socket "/tmp/mysql5.sock"
AddType x-mapp-php5 .php

I hope someone can help.

Best,

Greg