Hi,
got the same problem but i'm using rsync cmd without ssh:
$Conf{RsyncClientCmd} = '/usr/bin/sudo $rsyncPath $argList';

This is the output from the error log:
incr backup started back to 2008-11-14 08:56:58 (backup #0) for directory /var
Running: /usr/bin/sudo /usr/bin/rsync --server --sender --numeric-ids --perms 
--owner --group -D --links --hard-links --times --block-size=2048 --recursive . 
/var/
Xfer PIDs are now 31103
Got remote protocol 29
Negotiated protocol version 28
Sent exclude: /var/lib/backuppc
Sent exclude: /var/lib/tmp
Sent exclude: /var/lib/spool
Sent exclude: /var/lib/cache
Read EOF: 
Tried again: got 0 bytes
fileListReceive() failed
Done: 0 files, 0 bytes
Got fatal error during xfer (fileListReceive failed)
Backup aborted (fileListReceive failed)

FYI: The initial full backup works fine but the first incr backup fails.

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