Hundreds of MySQL Errors by 1 IP Daily

[rantrave]

Here's a copy of the error:

mysql_connect(): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (11)

/forums/includes/class_core.php on line 279

I get this same error from the same ip everyday, is it possible that it's an attack? Also, what in layman's terms does this error mean. It's causing my host mucho trouble, and could get the boot, so your assistance is greatly needed.