/usr/local/bin/rsync -az -e 'ssh ' 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: Address 18.104.22.168 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.
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