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ASP FAQ Tutorials :: Classic ASP 1.0 :: General Topics :: What is wrong with Session_OnEnd()?
What is wrong with Session_OnEnd()?
- Why does Session_OnEnd() not fire?
There are two disparate scenarios here. One is when Session_OnEnd() doesn't get called, and the other is when the code within Session_OnEnd() fails. Don't get me wrong, when we get right down to it, Session_OnEnd() is unreliable. Do not create applications that rely on Session_OnEnd() to occur, because it doesn't always happen.
For some more information on this problem, see the following KB articles:
KB #247968 PRB: Connection to SQL Server from Session_OnEnd() Event May Fail
KB #277329 PRB: Cannot Access Network Resources in Application_OnEnd or Session_OnEnd Events
With that aside. A common cause of code in Session_OnEnd() failing is permissions. Note that under typical IIS configurations, the code being executed is running in the context of IWAM_<MACHINE_NAME>, not IUSR_<MACHINE_NAME>. So even though you may have fixed permissions for IUSR_<MACHINE_NAME>, you will need to follow the same process for IWAM_<MACHINE_NAME>. Though keep in mind that a resource that you are trying to access does not have to be on a remote machine for IUSR or IWAM to encounter permissions issues.
For some general help on using Session and Application objects, see the following article:
KB #300883 How To Use Session and Application Variables in an ASP Program
- Why can't I use Server.MapPath or Response.Redirect?
Session_OnEnd() does not support the Request, Response or Server objects. The only built-in objects you can use are session and application. So, for example, if you need to use a server.mapPath directive, store the fully qualified path in an application variable BEFORE the session ends. However, in limited testing, I was able to use these objects in files #included in global.asa (for the technique, see Article #2144).
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