RE: ASP.Net timeouts

Hi,

We've got a page that's throwing HttpException "Request timed out" error
messages and for the life of us we can't figure out why. One of the
problems
is that there is no stack trace with that exception so it's harder to
figure
out what it's doing when the clock runs out. Attaching a debugger
obviously
changes things.

I've found a number of posts online where people say there are 2 event log
messages for both the HttpException and the underlying
ThreadAbortException.
In the screen caps I've found the event log message for the
ThreadAbortException includes the stack trace of the thread getting
whacked.

From your description, the innerexception of this HttpException is null.
There's no managed call stack on the thread that throws this exception.

This behavior, based on my experience, is typically caused by
executionTimeout is smaller than the real execution time. You can not get
any managed call stack of the thread that throws this excetpion because
there's no one. And it even doesn't make sense to get it because the tasks
that potentially cause this issue are run by other threads.

You can reproduce it if you set the executionTimeout to a small value and
do a lot of time consuming taks in the processing request phase:
<system.web>
<httpRuntime executionTimeout="3" .../>
...
</system.web>

Please check out the following documentation for more details about this
element:
http://msdn.microsoft.com/en-us/library/e1f13641.aspx

So, first, please let me know the approximate process time of the web
request that causes this exception. You can do unit test to get the time.
If it's longer than two minutes, most likely this is the culprit, if you're
using the default setting of httpRuntime element.

You can also add some trace at the begining/end of any time conusuming
tasks. This will give you a clear picture of which task is done before this
exception.

If you use WinDbg to debug, please use the following command to list all
call stack of managed threads:
~* e!clrstack
In this way you can know what all managed threads are doing at that moment.

Download Debugging Tools for Windows:
http://www.microsoft.com/whdc/devtools/debugging/default.mspx

Please keep me updated if you find anything. If you have further questions
please feel free to ask. I'll do my best to follow up.

Regards,
Allen Chen
Microsoft Online Support

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