ASP Error Event information is missing the file name

I am using Windows 2003/IIS 6. The following event occurs during the day. i
want to debug the culprit ASP page which is causing this, but having hard
time without knowing on what page and website where the error occurs.
May anyone have any idea
1)how to change the server configuration so it will log the page, or
2) is the error log stored elsewhere (i checked
onWINDOWS\system32\LogFiles\HTTPERR, but it logs different sort of errors),
or
3)is there another way to log only errors (we have an internal error
monitoring system, but this error seems to escape it. maybe it's on
global.asa)?

Thanks in advance,
Amitay

Event Type: Warning
Event Source: Active Server Pages
Event Category: None
Event ID: 9
Date:  28/03/2005
Time:  18:00:37
User:  N/A
Computer: WEB1
Description:
Warning: IIS log failed to write entry,   Script timed out. The maximum
amount of time for a script to execute was exceeded. You can change this
limit by specifying a new value for the property Server.ScriptTimeout or by
changing the value in the IIS administration tools..

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.