Yep, I would start with the firewall, and check the logs there to see what happens when someone connects externally and if its routed correctly.
If it is, work your way to the IIS ARR and check logs, then finally to the Exchange Server.
Exchange 2013 OWA login loop - External Access Only
Our Exchange 2013 servers are having OWA login loop when accessing it externally. While accessing it through localhost or IIS ARR (DNS record points to IIS ARR for mail.domain.com) there's no looping issue.
External CAS routing:
Public DNS record > Firewall > NAT to IIS ARR > Forward to Exchange 2013 CAS servers
Internal CAS routing:
Internal DNS record > IIS ARR > Forward to Exchange 2013 CAS servers
Since I can access it from internal network by pointing client machines to Exchange server directly and also to IIS ARR. I can see the issue should be from the Firewall.
Any idea guys?
2 answers
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Andy David - MVP 149.2K Reputation points MVP
2022-03-09T12:17:30.39+00:00 -
Andy David - MVP 149.2K Reputation points MVP
2022-03-10T11:46:28.317+00:00