asp.net - Tracking Down Mysterious Errors -

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i have rather complex legacy asp.net application under continuous development, , 1 client has started erroring recently.

the application uses asp.net 3.5 , c# on server side, backed sql server 2005 , iis6.

the application utilises microsoft asp.net ajax libraries , devexpress components.

we have comprehensive logging platform in place, via page_error handler in custom page base, logs unhandled exceptions , displays nice error page.

the problem is, 1 client has started getting errors cannot trace - nothing logged, despite nice error page being displayed. no exceptions caught , handled page_error handler, method redirects users error page - , no redirection happens without error being handled.

i have added client side javascript asp.net ajax pagescriptmanager endrequesthandler javascript handler logs clientside errors wide open ashx logging script.

the errors client side catches follows:

sys.webforms.pagerequestmanagerservererrorexception: unknown error occurred while processing request on server. status code returned server was: 0   sys.webforms.pagerequestmanagerparsererrorexception: message received server not parsed. common causes error when response modified calls response.write(), response filters, httpmodules, or server trace enabled. details: error parsing near ' <!doctype html p'.

these errors have no corresponding server side error.

unfortunately, there no scope set unit tests project, large , wouldn't know begin client-server interaction part.

my question is, can recommend method of seeing erroring, why erroring , why isn't being caught page_error handler?

you try using elmah catch exceptions aren't handled inside application.


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