We’re continuing having a problem with a production application. The
application uses ASP.NET web services and about once a day, the web services
stop responding. The only resolution is to restart IIS or wait until IIS
detects that there is a deadlock issue and resets itself. We are constantly
seeing an event show in the event log. After this event appears, IIS resets
itself and starts working again. The event is below.

Can anyone help me troubleshoot this issue?

Event Details
Event Type: Warning
Event Source: W3SVC-WP
Event Category: None
Event ID: 2262
Date: 12/12/2007
Time: 9:43:23 AM
User: N/A
Computer: FDYRS946
Description:
ISAPI 'C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\asp net_isapi.dll'
reported itself as unhealthy for the following reason: 'Deadlock detected'.

When the web service deadlocks (hangs) run iisdump.exe.
After the dump finishes, run windbg.exe (get the latest version), load
the dump file and inside windbg do:

the "~*e !clrstack" command gives you the stack of the all the managed
threads and should help you to see where the deadlock is taking place.

Other instructions you may want to follow (where the scenario is
similar to yours) are available here:
http://blogs.msdn.com/carloc/archive...means-hot.aspx

hope it helps,
Tiago Halm