Exchange Server 2016 ECP/OWA - Blank Page is loading

[Dammz]

Hello All

I am experiencing this issue since last week and users are unable to login to OWA web login as it stops with a blank page. (On both Servers)

Sometimes when the server restarts it is started to working, but after a few minutes the issue starts again.

Environment: Exchange 2016 DAG 2 Node (Build: 15.1.2507.12)

I already tried below.

1. SSL Certificate status in Default Web Site and Back End Site - Both has the same third party certificate assigned. (Tried with self signed certificate too)
2. Recreated ECP and OWA virtual directories (on both servers)
3. Ran the scripts - UpdateCas.ps1, UpdateConfigFiles.ps1 and updated the servers.
4. Updated Exchange to the latest build - 15.1.2507.12

Any suggestions?

Thank You.

[#2]

have you checked the exchange server auth authentication certificate?

[#3]

Microsoft Exchange Server Auth Certificate is in valid state.

[#4]

the problems you mentioned may be due to the following reasons.

Incorrect time settings in server clock

Exchange components or license issues (i recommend you to do a health checker)

you can change the browser

[#5]

Time settings are correct.
However I can see lots of "400 2 Connection_Dropped MSExchangeRpcProxyAppPool" errors in IIS log folder at C:\Windows\System32\LogFiles\HTTPERR.