Hi guys

A small number of our sites intermediately experience an error that is a mystery to us.

Our set up is:

• Windows Server 2003
• IIS6
• .NET 3.5
• We have about 35 Websites running on IIS
• Each site has it's own App Pool
• Each App Pool has the identity: Network Service

The symptom is: The Application Pool for a site stops, and when you browse to the site, you only see:

SERVICE UNAVAILABLE

In the Event Logs, we have one Error, that looks like this:

Application pool 'AppPool1' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

And we have several Warnings leading up to the error, that look like this (note: the warnings look the same, except for the process id):

A process serving application pool 'AppPool1' suffered a fatal communication error with the World Wide Web Publishing Service. The process id was '292'. The data field contains the error number.

What's causing this? As I said, it doeasn't happen very often....the last time was about 6 months ago...and it usually happens with the same site/App pool.

Any ideas?

cheers!