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I have two pools running on the same server. I noticed one of them is configured to a 20 min idle timeout, and the other is 180 mins.

I can see this message in event viewer: "A worker process with process id of '1964' serving application pool 'A' was shutdown due to inactivity. Application Pool timeout configuration was set to 20 minutes. A new worker process will be started when needed."

Is that going to affect pool B? I had a skim through the logs and can't see the same message for pool B. I assume both pools use the same worker process, or is that not the case. Thanks

chris c
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  • "both pools use the same worker process" is impossible. Starting from IIS 6, application pools are introduced for isolation, https://docs.microsoft.com/en-us/iis/configuration/system.applicationhost/applicationpools/#overview – Lex Li Jan 13 '20 at 13:22
  • @LexLi ok thanks that's really good to know, and will help me narrow down what might be going on. I suspect the IIS worker process becomes unresponsive now and then. Thanks – chris c Jan 13 '20 at 21:35
  • IIS worker processes are simply web application containers. So if you find such processes do not respond to incoming requests, the common cause is your web apps. Guides like https://www.leansentry.com/Guide/IIS-AspNet-Hangs can get you started. – Lex Li Jan 13 '20 at 22:08

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