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We have an issue where the whole iis server is crashing. From my understanding when an application crashes (due to infinite loop or else) only that application pool is taken down.

In our sceanrio all Application Pools (we have more than 1) are stopped. We're still trying to pinpoint the cause but in you experience would a faulty app take down the whole IIS?

Any insights would help greatly.

atp03
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    What do the logs say? (*Ring ding ding ding ding*) – Ryan Ries Jan 25 '14 at 14:58
  • Trust me we've looked at the logs. We're trying to determine if it's possible for an app to bring down the whole server let alone a single app pool. – atp03 Jan 25 '14 at 15:05

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Yes, it is possible, though unlikely, that a user mode process can even cause the entire machine to BSoD.

Since you are experiencing a problem where all app pools on the server are crashing and/or stopping, it might be logical to deduce that the error is occurring on an underlying component that is common to all app pools.

IIS Architecture

HTTP.sys is one such underlying component that is common to all app pools. HTTP.sys has its own logging mechanism that you need to enable:

http://technet.microsoft.com/en-us/library/cc784703(v=WS.10).aspx

I bet those logs could shed some light on the situation.

Ryan Ries
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  • Lovely insight thanks! It's not exactly a BSOD but we're suspecting that one of the app (out of many) is causing all the App Pools on the server to stop. Log files still not yielding anything and nor is the event viewer. – atp03 Jan 25 '14 at 16:48