Hi there, 2 Exchange 2019 standard servers on server OS 2019, hostnames snmta20 and snmta21, update from CU9 to CU10 worked on snmta20. not on snmta21 despite may trials. Both are dual stack, IPv6 tested and working. Below a short summary of the findings:
Always error at end of step 12/6 Mailbox role: Mailbox service
SNMTA21 IS IN MAINTENANCE MODE, snmta20 is in normal mode
• Error message from CU10 update process: "System.InvalidOperationException: Failed to mount database "MBX-DB-02". Error: An Active Manager operation failed. Error: Operation failed with message: Error 0x5 (Access is denied) from cli_MountDatabase3 [Server: SNMTA20.SNNET.CH]
• Database redundancy: SNMTA21: The RPC to retrieve the status of active database copy 'MBX-DB-01\SNMTA20' failed. Error: A server-side administrative operation has failed. Operation failed with message: Error 0x5 (Access is denied) from RpccGetCopyStatusEx4 [Server: SNMTA20.SNNET.CH]
• All 3 MBX-DB’s on SNMTA20 as seen from SNMTA21 have status SERVICEDOWN and thus cannot be accessed. From SNMTA20 all 3 MBX-DB’s look good, 3 mounted (SNMTA20), 3 healthy (SNMTA21)
• Event 2280 IIS-W3SVC-WP: The Module DLL C:\Exchange2019\V15\FrontEnd\HttpProxy\bin\exppw.dll failed to load
• Event 5139 WAS: A listener channel for protocol 'http' in worker process '23044' serving application pool 'DefaultAppPool' reported a listener channel failure.
• Service “Microsoft Exchange Search Host Controller” is running
• All server components of SNMTA20 are active, all on SNMTA21 are inactive
• All server components of SNMTA21 cannot be set into Active state, possibly due to maintenance mode.
Assumed a permission problem and have therefore added Organization Management with Full Control to all three MBX-DB directories and MBX EDB files. Also gave Full Control to Authenticated Users. Did not help. Thank you for any suggestions, Marcel