UrBackup Server Version 2.5.33 running on Debian Linux
Windows 11 Client Version 2.5.25
Windows forced two updates to the Windows 11 client system. The updates were KB5083769 (Cumulative update for Windows 11, version 25H2 and 24H2) and KB5082417 (Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2).
File backups for the system have not worked since the updates. The backup starts and the server connects for the filelist. From the UrBackup Live Log:
| 04/17/26 14:12 | INFO | Starting scheduled incremental file backup… |
|---|---|---|
| 04/17/26 14:12 | DEBUG | laptop-x Connecting for filelist… |
| 04/17/26 14:12 | DEBUG | laptop-x: Waiting for filelist |
| 04/17/26 14:12 | DEBUG | laptop-x: Connecting for filelist (async)… |
There are no further entries until the backup eventually fails with a “CONNECT error during filelist construction (2)” error.
Things I’ve tried so far:
- Reinstalled the UrBackup Client
- Verified that the network is still configured “Private”
- Verified that the third-party firewall rules for UrBackup are still configured and enabled.
My guess is that KB5083769 is the cause of this issue. I’m considering upgrading the client to Version 2.5.29. Other than that, my next option would be to back out KB5083769. I’m hesitant to do this since it’s a pretty hefty security update and includes some support for updating the expiring Bitlocker certificates.
Anyone else experiencing this issue?
Any thoughts on the usefulness of upgrading to client Version 2.5.29?
Other suggestions?
Thanks in advance for any response.