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bclee
Copper Contributor
Jul 23, 2024

OWA loop after Exchange 2019 enabling Extended Protection

Has anyone encountered before?

Scenario

  • Exchange environment is Exchange 2016 & Exchange 2019.
  • Exchange 2016 - Extended Protection not enabled
  • Exchange 2019 - Extended Protection enabled.
  • User mailbox is residing in Exchange 2019
  • User attempt to login via OWA (FBA) on Exchange 2016
  • When login, the page keeps looping back to the logon screen.

Error in httproxy owa logs: WebExceptionStatus=ProtocolError;ResponseStatusCode=401;WebException=System.Net.WebException: The remote server returned an error: (401) Unauthorized.

 

Attempted to login to both OWA & ECP via OWA on Exchange 2019 - successful.

 

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