.Net Framework: exception in w3wp.exe

We fixed this isse. For us, it was because of the permission levels to write into log. Changed the permissions in IIS.

Repeat this step for each site.

1. Open IIS Manager.
2. Select site.
3. Open Authentication
4. Edit "Anonymous Authentication" Credentials. Change to use Application Pool Identity.
5. IIS Reset

I found the message in event viewer:

"Description: The process was terminated due to an internal error in the .NET Runtime at IP 6B484BC2 (6B300000) with exit code 80131506."

It was caused by updates of .Net Framework 4.5. I uninstalled last update. It solved the problem.

Tip: How to check event viewer. Visual Studio > View > Server Explorer > SERVER_NAME > Right click on "Event Log" > Launch Event Viewer > Windows Logs > Setup.

There is information about the error: http://support.microsoft.com/kb/2640103/en-us. But hotfix is available by request to Microsoft only.

I don't remember number of "harmful" update. But I think, everybody will be able to find last updates to remove them.

This can be caused in ASP.NET when an infinite loop occurs.

A common example is rendering a partial view which then renders itself in ASP.NET MVC.