Forum Discussion
upgrading from exchange 2013 to 2019, new install of 2019..cannot login to ecp or owa
ok, after spending $500, 3 weeks and 4 engineers, I finally have this fixed...i hope this will help you.
the moral of the story is pay attention to the warning messages. In mine, you will see it referencing a cert thumbprint. this thumbprint is the Microsoft Auth Certificate on my Exchange 2019 server. I had found this https://learn.microsoft.com/en-us/exchange/troubleshoot/administration/cannot-access-owa-or-ecp-if-oauth-expired but it talks about your auth cert being expired...my auth cert was not expired so I dismissed it...and so did the Microsoft tech until they could not think of anything else to do....so they recommended we recreate the auth cert any...and this fixed my issue.
if you have this warning message, the issue is almost certainly the cert it references!
good luck
AnnTaeYoun hi, thanks, my SAN cert was bound to port 444 so i changed it back to the "Microsoft exchange" cert that setup created and i did an iisreset....that did not help.