I had a similar problem. What fixed it for me was:

1) Stop the Backuppc service: /etc/init.d/backuppc stop (if you have 
init.d scripts working)
2) eval `ssh-agent`
3) ssh-add (and then type password at prompt)
4) Start Backuppc: /etc/init.d/backuppc start

You need to start Backuppc from the same shell that you run ssh-agent 
from and after you run ssh-agent so that it can pick up the necessary 
hooks. If Backuppc is already running when you run ssh-agent then it 
won't work.

Hope this helps,
David

On 15/08/10 09:40, Luis Paulo wrote:
> On Sun, Aug 15, 2010 at 6:58 AM, waverider
> <backuppc-forum AT backupcentral DOT com>  wrote:
>> Thanks luis,
>>
>>>
>>> I have tested Rsync with the remote device using the format:
>>> rsync -avz -e ssh remoteuser<  at>  remotehost:/remote/dir /workstation/dir/
>>> and the files are copied correctly without asking for password, so rsync is 
>>> working OK.
>>>
>>>
>>
>>
>>>
>>> That error usually means you have a problem with the ssh
>>> connection.There were several discussions of the "read 4 bytes" error
>>> on this mailing list. Also about the possible forms to connect with
>>> ssh.
>>>
>>> Try, from the server, to run
>>> $ ssh root<  at>  192.168.72.11
>>>
>>> You'll need a passless ssh connection or some kind of ssh agent.
>>> Otherwise the backuppc connection will not be successful.
>>>
>>
>> As I said above ssh and rsync work and provide passless connection so the 
>> problem must be in Backuppc config somewhere
>>
>
> Read EOF: Connection reset by peer
>
> If you are sure ssh is working, no ideas, then.
>
> Maybe you can tell what linux and backuppc versions you are using, and
> hope someone else may help.
>
> Good luck
> Luis
>
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