On Nov 21, 2008, at 12:50 PM, John Almberg wrote:
This is the week for strange problems...
I use rsync to copy tinydns data files to backup name servers. This
has been working for about a year with no problem. Suddenly, I am
getting odd errors:
/usr/local/bin/rsync -az -e 'ssh ' data.cdb [EMAIL PROTECTED]:/
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 220.127.116.11 maps to
on.example.com, but this does not map back to the address -
POSSIBLE BREAK-IN ATTEMPT!
Nov 21 12:43:38 qu sshd: Accepted publickey for root from
18.104.22.168 port 55777 ssh2
I'm guessing this is some sort of DNS mis-match, but I don't quite
grasp what the problem could be.
Ahhhh... a reverse DNS problem!
Sorry for the dumb question, but it's amazingly helpful to just write
down the question clear enough for the group. It frequently clarifies
the problem to the point where the answer becomes obvious, even to a
newbie like me.
DNS had been delegated to this server, but now that seems to be no
longer working, so the reverse DNS look up is all wrong. That makes
sense... an external change by the colo guys must have triggered this.
Will get on to them, and that should short this problem out.
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