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POHow to trap an ASP.NET error which triggers Custom Error Page, but not Application_Error
 

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  1. POHow to trap an ASP.NET error which triggers Custom Error Page, but not Application_Error
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    <p>I have an ASP.NET application using custom errors. There is one error that occurs that I can't seem to get any information about. When the error happens, it does trigger the custom error page, but for some reason it doesn't trigger Page_Error or Application_Error. If I turn CustomErrors Off completely, I get absolutely no feedback at all. The only feedback I ever have gotten up until now is the redirect to the Custom Error Page.</p> <p>Scenario: ASP.NET WebForms application. One of the pages has an UpdatePanel with a Submit button. The page works fine. But if I walk away for a while (seems to be 30-60 minutes) and then come back and click the Submit button, nothing happens; no error, no response from the page- nothing. I have not been able to get this to happen while running in the Debugger; it only happens when it is hosted in IIS (7.5). [I've seen other SO posts about this issue but none of the suggestions worked for me.]</p> <p>When the error happens, with CustomErrors=On or RemoteOnly, the redirect to the custom error page works, and with RemoteOnly, from the server, I get no feedback at all, similar to a remote connection with customerrors=off. I was really hoping for the YSOD error page.</p> <p>I tried trapping the error in Page_Error by logging the errors to a database, but that didn't work either. I know the Page_Error and the DB portion is working because if I change the submit code behind to do a divide by zero, the error is logged in the DB. Also, the divide by zero error will be displayed to the client with customerrors=off, and with it on it will display the custom error page. But removing the divide by zero error, and then waiting 30 mins or so and trying again, the Page_Error code is not hit, even though it does redirect to the custom error page. I then tried moving the code in the Page_Error to Application_Error, but the exact same thing happens. The forced divide by error works but this seemingly timeout related error does not.</p> <p>So, are there certain errors that can still trigger the redirect to the custom error page, but will not trigger the Application_Error event?</p>
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      1. POHow to trap an ASP.NET error which triggers Custom Error Page, but not Application_Error
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    1. COI had a similar error in code called from an AJAX update. Elmah was able to capture the exception. I'm sure it would also be visible using ASP.NET Health Monitoring. Finally, I actually received an AJAX error with the exception message.
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      1. USJohn Saunders
    2. COIf the error is handled by IIS before it gets to ASP.NET execution pipeline, you cannot capture it in code. Is it possible that IIS process was recycled or session timed out? Enable failed request tracing in IIS, it might give you more information about the failure.
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