In Event Viewer, you can open the property pages for each type of log and configure the filter options that generally apply to all events.
IIS increases the degree of control by providing two metabase keys that enable you to specify what is sent to the Windows Events log when ASP events and errors occur: AspLogErrorRequests and AspErrorsToNTLog.
The AspLogErrorRequests property controls whether the Web server writes unsuccessful client requests to the Windows event log file. If AspLogErrorRequests is set to TRUE, a standard set of ASP error requests are logged.
If AspLogErrorRequests is set to TRUE and AspErrorsToNTLog is set to FALSE, then the ASP errors are sent to the IIS log. If these errors are serious ...