Hi,
I have a problem where my TFS AppPool and TFSWSS app pools are shutting down. Also If I try to view the web site, the message I get is "Service unavailable" even though IIS is running. I restarted IIS and the app pools and it keeps happening. I tried rebooting it the other day and that fixed it but since the problem came back I don't think that's the solution. Here are the errors that are in the System Log.

The repeating error that causes the app pool to shutdown after 5 instances in 5 minutes is:

I haven't seen this particular error before- are there any other services running on the Application Tier that may have changed IIS settings? Have any settings been manually changed? You may want to check to make sure the PeriodicRestartPrivateMemory metabase property is within the allowed bounds. You can use the IIS 6.0 Resource kit to check and update this setting.

When I have seen the "Service unavailable" web site, it's usually because the service account password had changed and needed to be updated as described in "Managing and Resetting Service Accounts and Passwords".

Hope this helps--

Cheers,
Adam