Exchange HTTP Error 503. The Service is Unavailable

issue happen while renewing Degicert SSL certification , due to some unknown reason exchange took self-sign certificate which results , ECP,OWA, Exchange shell was not able to access and email follow was also interrupted

To resolved the issue below were the action taken :-

  1. To Open “ISS Manager”, Type “inetmgr” in “RUN” and select Default Web site and Open “Edit Binding option”
  2. Now Select Port “443”.


3. Check the SSL Certificate setting and assigned “Correct Exchange Certificate”      which you have imported with the help of degicert tool


4. Similarly, check for Port “444” Under Exchange Back End Change and View Settings.

444 is for the backed


5. After checking the Configuration of APP pools mentioned in the first restart the IIS services or restart the exchange server.






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