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The server is set to its default configuration to recycle the app pool every 1740 minutes. When this happens the following message is logged:

A worker process with process id of '1234' serving application pool 'XX' has 
requested a recycle because the worker process reached its allowed 
processing time limit.

Directly after logging this message, the web site is unresponsive. The only way to get it back online is by running iisreset manually.

Does anyone know a fix for this behavior, other than turning the recycle feature off? Is it a known problem?


The problem has been isolated to a specific patch release. I'll be researching the changes in the patch in the coming week, and update / answer this question with the solution or more detailed problem depending on what I'll find

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Is the app pool up or down before you issue the iireset, have you checked? What version of IIS? What is your app? C#? Lastly what do you mean by unresponsive - what's the specific error you see? – Dave Holland Apr 3 '10 at 16:15
The way to reproduce this without waiting 1740 minutes is by hitting the website, recycling the app pool, and keep refreshing it a few times during the recycle. I'm not sure about the error message, Chrome says it's empty content, firefox says it's 200 OK, and a monitoring tool in fact says its 500. According to IIS log the responses are 200 OK, with a content length of 0 – Sander Rijken Apr 3 '10 at 16:32
What is your web app written in? – Dave Holland Apr 4 '10 at 0:39
It's written in C# / ASP.NET – Sander Rijken Apr 4 '10 at 20:21
Did you ever get closer to the solution for this? I am having the same problem. – Niels Brinch Jul 22 '13 at 12:14

EDITS in bold:

You either have SharePoint or Exchange or Some Application installed/configured on the IIS Server. When recycling of the worker process happens i.e. after every 1720 minutes internally the command used is "IISRESET". But, since the recycling has taken more time than normal for graceful shutdown which exceedes the default time-out value i.e. 60 seconds and hence the event. During this recycling of the worker process you won't find any downtime as when the old process is going down a new process is created and its takes care of the new requests. Check this article How Worker Process Recycling Works

The Event seen would be something like

Event Type: Information
Event Source: W3SVC
Event Category: None
Event ID: 1074
Description: A worker process with process id of '1234' serving application pool 'sameappPool' has requested a recycle because the worker process reached its allowed processing time limit.

To overcome the issue, the recycle command should be "IISRESET /NOFORCE" such that it allows for the services to stop them gracefully.

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It is not iisreset that is executed every 1740 minutes. It's called a recycle, not a reset. A recycle happens without downtime. Also, I don't have SharePoint or Exchange running, nor can I set the recycle event to be something else. It's also not related to the timeout value which is 90 seconds by default. A timeout during startup or shutdown causes a slightly different message to be logged. – Sander Rijken Apr 3 '10 at 14:27

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