How can I trace IIS 500 errors thrown by my webservice

Question

I have deployed a new version of an ASP.NET webservice. The IIS logfile reports an errorcode 500 when this service is being called by a client. My own (test) can use the service without any error. I have enabled errorlogging in my ASP.NET webservice, but no error is being logged, which leads me to believe the error is not thrown by my code, but somewhere 'earlier' in the stack. I have also examined the httperr1.log file but there's nothing relevant there.

Question, how can I add more errorlogging to IIS to investigate the error? I have no access to the client.

[Updates] I'm using IIS6. I've checked the eventlog and found nothing there.

Answer 1

Which version of IIS are you using?

In IIS7 you have extensive tracing capabilities.

Take a look at: Troubleshooting Failed Requests Using Tracing in IIS 7.0