n5200pro nsync - transfer stuck at 1st file

I have two n5200pro, one of which is the backup target for the first. I have set up nsync source and target,
tested communications and set up a user. When I now start an nsync task, it starts transferring the first file,
but gets stuck with this first file, does not finish it and does not start the transfer of the next file. This is independent
of file size and name and it also occurs when there is only the nsync user logged on and nobody else has mounted
folders. This is also independent of the type of nsync task (ftp or Thecus native). I found the Thecus nsync guide
online and followed it step by step, but the problem still exists. I would greatly appreciate any help.

Thanks,
Terri

Which FW do You have? There was one FW version with nsync problems.
br
Peter

Thanks, Peter:

I have FW 2.00.10, but the firmware was not the problem:

When I uninstalled the modules SYSUSER and SSHD, the problem
disappeared and nsync now works well. But of course I would like
to have those modules back ...

Terri