Matt, it seems there are not ASP errors recorded in the system event log because:
"This article demonstrates two methods of writing events to an Event Log from Active Server Pages (ASP). ASP does not provide a built-in mechanism to log events to Microsoft Windows Event Logs. One of the popular approaches is to build custom Component Object Model (COM) components using Microsoft Visual Basic or Microsoft Visual C++, which provide methods to write events to an Event Log and use the component in the ASP pages. Another approach is to use the Shell object of Windows Script Host"
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