The first problem was solved by installing Exchange 2019 CU8. The installation went smoothly.
Unfortunately, right after the installation on new servers there was a problem with access to OWA / ECP / Autodiscover etc. htttp error 500 after entering OWA or ECP.
Again, try to solve the problem by recreating OWA / ECP and backend among others. Without success.
Due to many different unusual bugs and the fact that I do not know the history of the Active Directory / Exchange environment, I decided to check a few things more closely.
I decided to check Exchange 2013 versions
C:\>Get-ExchangeServer | Format-List Name, Edition, AdminDisplayVersion
Name : EX01-2013
Edition : Standard
AdminDisplayVersion : Version 15.0 (Build 1497.2)
Name : EX02-2013
Edition : Standard
AdminDisplayVersion : Version 15.0 (Build 1497.2)
Here everything looks ok. Both Exchange 2013 CU23, with the newest CU (CU 22 i requiered to install 2019 in Exchange 2013 orgnization)
But here I found a problem, file versions different than Exchange AdminDisplayVersion
On EX01-2013 C:\>Get-Command Exsetup.exe | ForEach-Object {$_.FileVersionInfo}
ProductVersion FileVersion FileName
-------------- ----------- --------
15.00.1497.012 15.00.1497.012 C:\Program Files\Microsoft\Exchange Server\V14\bin\ExSetup.exe
On EX02-2013 C:\>Get-Command Exsetup.exe | ForEach-Object {$_.FileVersionInfo}
ProductVersion FileVersion FileName
-------------- ----------- --------
15.00.0847.012 15.00.0847.012 C:\Program Files\Microsoft\Exchange Server\V14\bin\ExSetup.exe
It turned out that the EX02-2013 server has different file versions than the system shows. I asked the administrators and it turned out that some time ago during the update of Exchange 2013 to CU23 the EX01-2013 server was updated without any problems and on the EX02-2013 server the update failed and it was recovered from the backup.
Now Active Directory / Exchange Organization has version CU23 entered but one of the servers (EX02-2013) has files Exchange Server 2013 SP1 February 25, 2014 15.0.847.32 15.00.0847.032 This version (Exchange 2013 SP1) is not compatible with Exchange 2019. Could it be all these problems?
I wonder what you can do with it?
Two options come to mind.
1) Try to update again on server EX02-2013 to CU23? I don't know what went wrong the first time.
The link on the MS site is not working https://www.microsoft.com/download/details.aspx?id=58392
I'm trying to enter from the site https://learn.microsoft.com/en-us/exchange/new-features/build-numbers-and-release-dates?view=exchserver-2019
2) Install a new Exchange 2013 with CU23, migrate the mailboxes from problematic EX02-2013 to a new server, uninstall "broken" EX02-2013. Try installing Exchange 2019 again.
regards
Daniel