Second Exchange blank page after login

I'm running 2x Domain Controlers (3t & 3t00 Win Server 2016 CU10) on the same domain with 2xExchange server (Mailbox Exchange 2016 ) configured with DAG. When both servers are online owa & ecp works fine. If 3t goes offline (which is the first server that i configure with AD and Exchange), then owa & ecp on 3t00 return blank page after log-in and Outlook won't connect.
I tried SSL Certificate change at bindings, also I recreated Certificates and finaly i tried recreation of owa & ecp VirtualDirectory.
I can connect to EMS at 3t00 and Exchange seems to work.
Any help to make 3t00 to work even 3t fails?
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Jose Gabriel Ortega CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
Check the Certificate binding in the "backend"
Make sure the certificate in the front end is the same as the one in the Backend

I did this some time ago:
That's exactly where you need to do.
Ioannis CharalampidisAuthor Commented:
Thank you for the answer. But i tried up to 10 times with every possible certificate  and restarting the server at least 2 times for each certificate. The same issue. After login blank page.
Jose Gabriel Ortega CastroCEO Faru Bonon IT - EE Solution ExpertCommented:
so you tried the binding in front-end and backend.
It's not every single certificate. just the one that says "Exchange server" it's a self-issued certificate.
IvanSystem EngineerCommented:

did you configure Exchange and AD on same server, 3t & 3t00? Or they are all separate machines?

Ioannis CharalampidisAuthor Commented:
Separate machines. I made 3t before 4-5 months and 3t00 the last 2-3 weeks.
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