Whatever Session_OnEnd is … well it’s not working
A developer’s strayings : Session_OnEnd not firing after applying Windows 2003 Service Pack 2:
We very recently discovered a bug in classic ASP (asp.dll) you get installing the Service Pack 2 for Windows 2003; removing the SP2 makes it work again as expected, so this is a regression bug introduced by the service pack itself. Basically with SP2 installed, the Session_OnEnd() method in classic ASP is not fired anymore, thus breaking all applications which rely on that event to run cleanup code.
Don’t know what that is..but whatever it is is also broken in Windows 2003 SP2