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Date: Sat, 22 Nov 2008 00:21:32 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: John Almberg <jalmberg@identry.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: rsync throwing odd error
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>
> /usr/local/bin/rsync -az -e 'ssh ' data.cdb 
> admin@qu.example.com:/usr/local/etc/tinydns/root/data.cdb
> channel 1: open failed: administratively prohibited: open failed
>
> The rsync does work. That is, the file is copied over. So this is actually a 
> warning, I guess.
>
> On the other server, the one the file is being copied TO, the following is 
> printed in /var/log/auth.log
>
> Nov 21 12:43:38 qu sshd[4604]: Address 67.111.0.194 maps to on.example.com, 
> but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

well it's as easy as reading messages.

you exactly posted answer to your question!

make your reverse DNS and forward DNS match.