"The request cannot be processed while th

Your site could actually be restarting either because of problems within your site or because problems with someone else's site causing an iis restart. Usually clears within a minute or so.

On thng you may want to look at is if you do any I/O out of global.asa. If you do, you need to use Application.Lock and Application.Unlock before and after the I/O to restrict that activity to one user at a time.

Failing to close objects or connections is probably the most common cause of restarts - but they may be on someone else's site, not yours - one of the drawbacks to shared hosting.