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Web app ends up exposing bug in Windows 2000

We are running a Web app (.ASP) on an IIS5.0 server and having problems with the DLLHOST.EXE file taking the CPU to 100% and then crashing. If we change it to run in medium (pooled) process, the same thing is happening. We checked the COM+ object and found the 'OUT_OF_Process' is the culprit by comparing PID numbers against the COM+. We tried using DCOM with no luck. We set the MAX Processor to 70% for that application but it still maxed out. We found a quick fix, but not a permanent one: we open REGEDIT and then close it for the problem to go away, but that only lasts for about 30 minutes per KB821457. Any ideas?

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The Knowledge Base article 821457 you mentioned has the answer to your question. Your Web app is doing something that is exposing a bug in Windows 2000. You can get a patch by calling Microsoft Support.

If you don't want to call Microsoft and get the patch, or wait for SP5, you can 1) fix the application, 2) replace the application, or 3) upgrade the OS to Windows Server 2003 and IIS 6.0.

This was first published in March 2004

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