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It is a .Net application.

I have been researching, but everything I have found was either related to Ajax or jQuery. PLEASE NOTE that the error we saw here is NOT related to any Ajax or jQuery related operations. It is related to the .Net w3wp worker process.

PROBLEM: Our customers reported that they are not able to Access the application and were getting this error. Before the issue got redirected to us (developers), the level 1 support team recycled the Application Pools in IIS and the App was up & running.

On going through our error logs, we saw this error thrown multiple times during that interval: "Message: There was an error processing the request."

Here is the exception log:

Timestamp: 06/10/2015 04:42:02 Message: There was an error processing the request. Additional Info: Stack_Trace[], Requested URL [], Browser[Chrome45], UserAuth[UserId[], UserName[], UserType[] ] Category: Error&Warning Priority: -1 EventId: 0 Severity: Error Title:ERROR Machine: xxxx Application Domain: /LM/W3SVC/2/ROOT-1-130885704011364329 Process Id: 9940 Process Name: c:\windows\system32\inetsrv\w3wp.exe Win32 Thread Id: 10100 Thread Name: xxxx Extended Properties: Transaction Id - xxxx

Please note that the error was getting caught for the same process every time: c:\windows\system32\inetsrv\w3wp.exe

Could anyone please help me understand:

  • What could have caused this issue?
  • What could be the possible reasons?
  • How could we handle this exception to avoid it in future?
  • Any reference links to refer to?

Any form of help in figuring this issue out would be really appreciated.

Mike Bonnell
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Prithvi
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  • Where is that lovely bit of logging coming from, though? Have you checked if the event viewer contains more information (such as the exact stack trace of what's going wrong)? – Jeroen Mostert Oct 07 '15 at 16:25
  • This is the IIS worker process. It just mean something went wrong with the request. You will have to find out the request that is causing the error. Event Viewer or IIS Log around the same time might help. Also check the app pool recycle settings. – XtremeBytes Oct 07 '15 at 16:26
  • I checked the event viewer and it is clean during that time. There are no records for 10/6/2015 04:42 AM. However, I do see a couple of error logs at 04:43, and that was AFTER the "error processing the request" exception was caught. Anyway, those errors were: An unhandled exception occurred and the process was terminated. Exception: System.NullReferenceException Application: w3wp.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. – Prithvi Oct 07 '15 at 19:42

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