Remote backup issue

Hoping the collective hive-mind has struck this. Getting out of the blue daily backup failures (code 1400) after a year of trouble-free operation.
Two units - source end, a PR2100. Target end runs an EX2 Ultra. Located in different buildings, so using the Remote backup app.
So after a whole bunch of testing - including ensuring both ends have the latest firmware, going as far as a reset on the target end, we are getting the following out of the source end:


2024/03/11 15:23:11 [16132] cmd=/usr/bin/sshpass -e ssh -ax -o StrictHostKeyChecking=no -o HostKeyAlgorithms=+ssh-dss -c aes128-ctr -l sshd machine= user=sshd path=/mnt/HD/HD_a2/B2/WUBN21030001_Br-Print-NAS/Daily_BUP/

2024/03/11 15:23:12 [16132] rsync: connection unexpectedly closed (0 bytes received so far) [sender]

2024/03/11 15:23:12 [16132] [sender] _exit_cleanup(code=12, file=io.c, line=228): entered

2024/03/11 15:23:12 [16132] sent 0 bytes received 0 bytes total size 0

2024/03/11 15:23:12 [16132] rsync error: error in rsync protocol data stream (code 12) at io.c(228) [sender=FW_5.27.105-149-gbfc7d29a]

2024/03/11 15:23:12 [16132] [sender] _exit_cleanup(code=12, file=io.c, line=228): about to call exit(12)


We have re-created the job from scratch, rebooted, loaded latest firmware and all with the same end result.
I can create the job, browse the destination fine and even create a new directory in the job, which then is created on the target end when the job starts. The job sits at 0% for perhaps a few minutes, then fails.

Can anyone help here or point me in the right direction?

Hi @JeroenJ ,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting: