Pursuing your suggestion when I executed "ssh -l root -T remote 
/bin/true" I was greeted with "stdin: is not a tty".

My googling resulted in

http://platonic.techfiz.info/2008/10/13/stdin-is-not-a-tty/

which indicates that the culprit is apparently "mesg y" in /etc/bashrc. 
After commenting out "mesg y" in my /etc/bashrc, "ssh -l root -T remote 
/bin/true" receives no output as you indicate is correct.

I have kicked off a full backup and I'll see how it goes, but I'm sure 
that it will work properly now that the "stdin: is not a tty" is gone.

For reference anyone hitting this on a search "mesg y" allows the 'wall' 
and 'talk' or other such commands to write to your TTY for intra-system 
chat on TTY's.

Thank you everybody for your help in clearing this problem up!

  - Nick Bright

Adam Goryachev wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Holger Parplies wrote:
>> Nick Bright wrote on 2009-11-09 17:57:11 -0600 [Re: [BackupPC-users] Backup 
>> fails after running 8-10 hours]:
>>> Les Mikesell wrote:
>>>> Nick Bright wrote:
>>>>> Got remote protocol 1768191091
>>>>> Fatal error (bad version): stdin: is not a tty
>> note the error message here. "stdin: is not a tty".
>>
>>> [...]
>>> Thank you for your reply. I checked in to it, and determined that there 
>>> isn't anything being output by logging in to the backuppc system and "su 
>>> backuppc" then "ssh root@cpanel":
>> It's not output, it's probably an 'stty' or something else that expects its
>> stdin to be a tty. Note that if you try it like you did ("ssh -l root cpanel"
>> without command argument), that's not the same as BackupPC is doing. stdin
>> *will* be a tty in this case, so you won't get the error. You should try
>> something like "ssh -l root cpanel /bin/true" instead.
> 
> Or better would be:
> ssh -l root -T cpanel /bin/true
> and you should get this:
> backuppc@host:~$ ssh -l root -T remotehost /bin/true
> backuppc@host:~$
> 
> ie, no blank line, no error, no text, nothing at all. If you see
> *anything* then you need to fix that first.
> 
> BTW, the -T means "Disable pseudo-tty allocation."
> 
> Regards,
> Adam
> 
> - --
> Adam Goryachev
> Website Managers
> www.websitemanagers.com.au
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