Why does the application pool automatically stop? [closed]

Question

I'm doing performance testing for my MVC internet application using IIS 7.0

Sometimes the application pool stops and I get an error saying "service unavailable" in my browser. I then have to restart the pool.

Why is the pool automatically stopped, and how can I solve this problem?

update And my log file has : "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\webengine4.dll returned an error from registration. The data is the error."

Answer 1

The application pool stops when it can't recover from an error/crash. Look at the Event Viewer under Windows Logs > Application to see the exception(s) that caused the crash. The Source column will mention something like ASP.NET 4.0.30319.0

Answer 2

Well, I encounter also this problem and this is what I do.

1) Open IIS.

2) Right click on your Application-Pool for the web application and select "Advanced Settings".

3) Set "Rapid-Fail Protection" -> "Enabled" to False.

If this is true, the Application pool is shut down if there are a specified number of worker process crashes within a specified time period. By default, an application pool is shutdown if there are 5 crashes within a 5 minutes interval.

I read the answer in this link [https://sharepoint.stackexchange.com/questions/22885/application-pool-is-auto-stopped-when-browse-web-application-in-iis7]

hope that this will give help to others.