HTTP 500 Internal Server Error on Call manager

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Try the following steps-
Open CMD and restart WWW and IIS.

net stop w3svc
net start w3svc
iisreset /stop
iisreset /start

Generally in such a scenraio, you have to start iis twice because it will fail at the first.

If WWW service is stuck on stopping, you may kill the service using the following command-
taskkill /F /FI "SERVICES eq w3svc"

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