Database error! Help me!

[mokoboo]

Hi, I have this problem with my DB, it sends me and my users to refresh the page, not found and vbulltin database error.
This is the message:

Database error in vBulletin :

Link-ID == false, connect failed
mysql error: 

mysql error number: 0

Please somebody tell how I can fix this.

Thanks.

[rake]

Either you've reached the maximum number of connections allowed (most common), or it can't connect for another reason. Check that you have persistent connections off, and talk to your host.

[Modin]

do you have it pointing to the right server? it should probably be set to localhost