Symptoms
After Windows Server update 5014754 is installed on a server that's running Microsoft Exchange Server, you notice event log entries for Event ID 4625 that mention "Logon Process: Schannel failure" in the "Detailed Authentication Information" section.
Resolution
To fix this issue, install the following cumulative update:
Cumulative Update 14 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.