Error 2003: Can't connect to MySQL server on 'localhost' (99)
 

I am facing some kind of problem. The error I am getting it's look like
"Errorno = 2003
Error Message = Can't connect to MySQL server on 'server IP address'
(99)".

This error is coming most of the time.

1) the server is also running when I got this error.

2) I checked the config file, there is no parameter defined for the mysql port, it might be using the default port no 3306.

3) I have checked the server with telnet also, I can connect to the server with the default port no, it's showing connected.

Can anybody help me ...