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The requested service, 'http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc/actas' could not be activated.

I did everything what is written here at this article:

But still this message appears sometimes. What can do to solve this problem? Thank you.

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What if you copy / paste that URL in à browser ? Regards – user39324 Feb 4 '15 at 13:55

There could be multiple reasons why the Security Token Service doesn't start. For example, the service account doesn't have the correct permissions (Logon as a Batch Job for Application Pool).

In the ULS Logs you will probably find more, and also check the System Log of Windows.

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Type iisreset on dos command line. Your reclycle application pool is still keeping wrong information even if your application pool stop and re-start. So, the best solutions is resetting your IIS.

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