Exchange 2019 single sign on (SSO) Issues

Hammoudeh 346

Hello All,

I have exchange server 2019 (dag) and i enabled single sign on "disabled form authentication and enabled windows authentication) and its working find, but when im trying to open owa from outside the organization im getting windows dialog box not customized owa login page:

and if the user ties to sing out from owa (outside the organization) then he could not sign-out and he must close all taps:

Can i fix those issues without disable SSO

Joyce Shen - MSFT 16,646 Reputation points

2022-05-09T06:25:31.83+00:00
Hi @Hammoudeh
Any progress here about this issue so far? Have you tried enabling forms-based authentication on the Outlook on the web virtual directory then verify the result?

Set-OwaVirtualDirectory -Identity "Contoso\owa (default Web site)" -FormsAuthentication $true

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Joyce Shen - MSFT 16,646 Reputation points

2022-05-13T05:25:10.23+00:00

Hi @Hammoudeh

I am writing to see how everything is going on with this thread. If you still have further concern on this, please feel free to let us know.

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1 answer

Andy David - MVP 142.3K Reputation points MVP

2022-05-06T15:16:11.077+00:00

Exchange has no idea if the user accessing OWA is internal or external.
You should enable Forms Based Authentication so the experience is the same for all users, otherwise, external users will get prompted with a windows prompt as you have seen
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Hammoudeh 346 Reputation points

2022-05-07T21:47:26.463+00:00

I'll build a lap and test it and update you.

thank you
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