ASP.NET web service call timed out and web method never called

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I am using Visual Studio 2005 Team Edition for Software Developers. C# is the language used.

I have a C# windows service running. This service will invoke a dll at runtime (many instances in parallel). Around 300 instances will be invoked in parallel. Each instance will inturn call a ASP.NET web service method.

I have kept log for each step of this processing. So I am able to see from the log table that the dll calls the web service successfully. For eg: Call is made by 8:32 AM. I have set a web service time out of 300000 (5 mins). So by 8:37 I am able to see "Webservice call timed out" with Time out exception in the log table.
Below are the two Issues I am facing right now.
1. From the web service log I am able to see for some of the records no call has been entered into the webservice after 8:32.
2. For some of the records, though we have called webservice by 8:32 AM it had entered webservice only after a delay in the range of 1 to 25 mins.

I am not able to figure out why there is delay in some cases and why there is some miss in entering the webservice itself.

Other than the 5 mins time out mentioned above, I have not specified any other configurations (like httpRuntime) in my config file. Usually the web service will take 2 to 10 mins for processing completion.

About 14% of the records alone face the above problem.

These issues are eating my brain.
Any help would be grately appreciated.

Posted 9-Nov-11 21:41pm

Jayaraman Ambri

Updated 9-Nov-11 21:49pm

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Oliver Bleckmann 10-Nov-11 5:06am

Just a guess, but these many PARALLEL calls made me think of unexpected behavior due to webserver configuration. maybe your requests are blocked as DOS attack, something like that!?

Oliver Bleckmann 10-Nov-11 5:09am

oh one more thing, recently i read about a problem on apache there seem to be a max of 10000 parallel tcp request for one instance. maybe packed sniffing helps debugging.

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