AD FS 2.0: Troubleshooting Event 364 and ThrowExceptionForHRInternal / NullReferenceException

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Posted by Shawn Cicoria on Geeks with Blogs See other posts from Geeks with Blogs or by Shawn Cicoria
Published on Fri, 04 Mar 2011 20:19:50 GMT Indexed on 2011/03/04 23:25 UTC
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Ran into a situation today where after AD FS federation server was installed, configured and up & running, “all of a sudden” it stopped working.

Turned out that another installer that affected the default web site, also seemingly affected the AppPools associated to all Applications under the Default Web site.

By changing the “Enable 32-bit Applications” either through IIS admin or via command line

appcmd set apppool /apppool.name:MyAppPool /enable32BitAppOnWin64:false

Back to normal…

 

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