Error 408 Request Timed out on 1 site only ?

[eva2000]

My vBulletin forum is on a litespeed web server powered server which also hosts Disboards.com forums.

Problem is for the past 2-4 days I haven't been able to load my forums or site via domain or directly via IP address. I see the browser status bar "waiting for mydomain.com" but if I leave it long enough like this, the eventually the error message I get is from litespeed web server is as follows:

Request Timeout

This request takes too long to process, it is timed out by the server. If it should not be timed out, please contact administrator of this web site to increase 'Connection Timeout'.

Where do I increase this connection timeout value ? Or more importantly why would I only now experience this request timeout when the site has been fine before ?

thanks

George