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

I did everything what here is written. http://support.microsoft.com/kb/2520344

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

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1 Answer 1

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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