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OWA Showing Blank Page

I am presented with the OWA Authentication page and enter my credentials and then it throws an “HTTP 500” error instead of opening the mailbox.

You tried to issue an “IISReset /NoForce” and even rebooted the server and still see the symptom.

So the issues is typically caused by the “Microsoft Exchange Forms-Based Authentication” service being in a stopped state. Starting the service immediately fixes the issue.

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