rsync - Nov 2008 - rsync returns unexplained error (code 129)

I synchronized two backup servers within a local network which worked fluently,
using rsync with the following parameters:

rsync    --archive \
    --hard-links \
    --delete \
    --rsh="ssh -i $key_file" \
    --copy-dest=/var/lib/backuppc \
    --compress-level=9 \
    --stats \
    --human-readable \
    --partial-dir=.rsync-partial \
    --bwlimit=$bwlimit \
    /var/lib/backuppc \
    $dest_host:$dir_name

 Althoug when I try to synchronize using the same command over the internet
(port mapping is enabled for SSH) the synchronization process starts, but
terminates after about one or half an hour and returns the following error
message:

"rsync error: unexplained error (code 129) at rsync.c(541)
[sender=3.0.3]"

 Could anyone explain this error or suggest a solution?

Thanks in advance,
Joris

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Has one machine been removed off site or is the machine you are syncing
with also changed?

Thanks

Joris Korbeeck <korbeeck <at> hotmail.com> writes:
> 
> 
... 
> "rsync error: unexplained error (code 129) at rsync.c(541)
[sender=3.0.3]"
> 
>  Could anyone explain this error or suggest a solution?
> 
> Thanks in advance,
> Joris
> 
I received this error when using an Expect script to call a bash
script to run rsync.  The expect script was timing out, so I set 
the timeout larger and I no longer received the error.