Same problem here!
About a week ago, we started getting the same error as Diederik reported. And have tried almost everything from re-installing the agent to different regedit changes. CCR - Enable Remote Streaming Backup are set to "1", and checked again.
We manage 20 different backupjobs, SQL, Oracle, FILE and Exchange. It's only the exchange backup which gives us problems, and we have located the problem to accessing the storage groups through browsing from the BackupExec server. We also get this error:
Completed status: Failed
Final error: 0xe000fe1f - The device cannot be found.
Final error category: Resource Errors
we are running a CCR cluster with a virtual node, and our backup job consists of DKEXCH01 (Virtual node which currently point to DKEXMB01) where we used to access the storage groups, and DKEXMB01+02 which are the clusternodes with the actual databases and logfiles. The problem is accessing DKEXCH01/storagegroup1-7 - I can't browse to this ressource through backup exec selectionlists anymore and the backupjob reports error everytime.
When I try to browse the job selectionlist, I can't select any shares (i guess the storage groups shows up as usershares) and the sharenames don't match with the selectionlist entries. And I cant access/browse the data, I get this error (in my example picture, the shares are not selected due to my editing so that's ok).
Hoping....
Thomas