Windows Server Backup error code 2155348147 with Eventid 546 caused by Bitlocker at a Hyper-V Server 2012 R2
Backup failed. Backup not started. The backup operation of the volume did not start.
At the eventlog, we found the following error:
The backup operation attempted at ‘2015-02-23T02:00:16.965013600Z’ has failed to start, error code ‘2155348147’ (The backup destination is not accessible because it is locked by Bitlocker Drive Encryption.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.
At first we proved that auto-unlock is really enabled, the command therefor is: Get-BitLockerVolume
The output has to be: AutoUnlock True
After some research we figured out that the server did not notice that the Bitlocker HDD had been auto-unlocked because it was auto-unlockend and we have been able to access the file system of the external HDD.
And now, believe it or not: Just after that access of the filesystem, the backup was successful.
We won’t make major cost in this small customers environment, so we decided to create a dirty workaround:
- Open Task Scheduler
- Create a new basic task
- The task should start everyday 5 minutes before the Backup starts
- Action: “Start a program”
- Program: “cmd”
- Arguments: “/c dir e: /s > e:\dir.txt” (E: should be your auto-unlocked HDD)
That was it. After that, every day the backup worked like a charm, reboots included.