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Some background first - We're running IIS 7 on Windows 2008. We're running around 250 websites per server with each site in it's own application pool.

I need a way to monitor each application pool for crashes and hangs and to send an email alert if an application pool is unresponsive for more than say 2 minutes.

I thought about having a virtual directory mapped into each site with an ASP.NET page that we could poll via our existing monitoring system (HostMonitor).

Does anyone else have experience in this area?

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2 Answers 2

Performance counters are available by Application Pool (under APP_POOL_WAS) and by ASP.NET Apps (the latter, by .NET version).

These include things like app-pool uptime, requests/sec and lots of other information.

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In IIS 7, you can use appcmd to monitor the apppool. For example, you type the command as below in CMD:

appcmd list apppool /state:Started

Then you should get a list of apppools which are running.

I suggest you that write a script with appcmd, and put the script as a scheduler task. Then you can get email notifications when some apppools are crashed.

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