Server unreachable but db error mailed?
 

I'm having trouble with the accesibility of my forum. Every few minutes it's not reachable and I get the 'can't find the server' browser message. But when I checked my mail, I suddenly saw some of this errors:

Code:
mysql_connect() [function.mysql-connect]: User 15vbdb already has more than 'max_user_connections' active connections
/home/vhosting/c/15/domains/*****/htdocs/www/forum/includes/class_core.php on line 311
Is it really possible a whole site can be thrown offline due to too much max_user_connections or is something really weird going on here?