[cut]

> > How do I debug this further?
> 
> For testing, you can remove the "1>/dev/null 2>/dev/null" 
> from the script to see the output of SSH. Note that the 
> backup will not proceed like this as SSH can't be 
> backgrounded without redirecting the output. 
> You could perhaps also redirect it to a file.

Now it seems better (I had mistyped the remote hostname):

Executing DumpPreUserCmd: /var/lib/backuppc/tunnel.sh -fC
administrator AT mail.omvsa DOT ch -L 8874:127.0.0.1:873 sleep 20
SSH Tunnel started successfully.
full backup started for directory data
Connected to localhost:8874, remote version 30
Negotiated protocol version 28
Error connecting to module data at localhost:8874: auth required, but
service data is open/insecure
Got fatal error during xfer (auth required, but service data is
open/insecure)
Backup aborted (auth required, but service data is open/insecure)
Not saving this as a partial backup since it has fewer files than the
prior one (got 0 and 0 files versus 0)
------------------

Still, there remains "auth required, but service data is open/insecure":
to what does it refer?

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