Microsoft Exchange 2013 shows blank ECP & OWA after changes to SSL certificates

This posting is ~4 years years old. You should keep this in mind. IT is a short living business. This information might be outdated.
This issue is described in KB2971270 and is fixed in CU6.

I ran a couple of times in this error. After applying changes to SSL certificates (add, replace or delete a SSL certificate) and rebooting the server, the event log is flooded with events from source “HttpEvent” and event id 15021. The message says:

If you try to access the Exchange Control Panel (ECP) or Outlook Web Access (OWA), you will get a blank website. To solve this issue, open up an elevated command prompt on your Exchange 2013 server.

Check the certificate hash and appliaction ID for, and You will notice, that the application ID for this three entries is the same, but the certificate hash for differs from the other two entries. And that’s the point. Remove the certificate for

Now add it again with the correct certificate hash and application ID.

That’s it. Reboot the Exchange 2013 server and everything should be up and running again.

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Patrick Terlisten is the personal blog of Patrick Terlisten. Patrick has a strong focus on virtualization & cloud solutions, but also storage, networking, and IT infrastructure in general. He is a fan of Lean Management and agile methods, and practices continuous improvement whereever it is possible.

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17 thoughts on “Microsoft Exchange 2013 shows blank ECP & OWA after changes to SSL certificates

  1. Ahmed Mahmoud

    thanks for the post, but in the last step u add sslcert with defined hash (which is not the same hash too) from where do u get this hash??

  2. Danny Covell

    Thank you so much. Saved me from a lot of angry people! Now I just wish Microsoft updates would stop breaking things…

  3. Hermano Queiroz

    Thank you so much! Very easy steps to follow and the exact same problem. FIXED!!!!

  4. Henk

    Thank you! Got this error after renewing certificates on 2013 and you’re answer was just what i need.

    Have a good one!


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