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I'm using a reverse SSH tunnel on Debian with openssh-server and autossh: something like -R 1234:localhost:22 with a monitoring port also set.

Generally, it works well, but I'm having the following problem: the tunnel opens and I see my remote server listening on 127.0.0.1:1234. But as soon as I try to establish a connection to this address:port, I get a "Connection refused" message and the port closes until autossh reopens it.

I have another tunnel, a -L. It sends its logs to this remote server. This tunnel seems to work as I'm receiving logs.

Anyone would have an idea of what's happening?

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  • do you have anything like a misconfigured snort or failban or iptables rules that could get in the way? Do you have a service already listening on 1234? Your -R command is definitely good so there's something else getting in the way. – zmo Mar 5 '14 at 20:41
  • Looking at the informations I have now, it looks very strange. This machine opens a few tunnels: -D (socks), -L (local) and -R (remote). All the -R tunnels won't work. I already ran some tests with fail2ban off or iptables ... – user305368 Mar 5 '14 at 20:47
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After a while, I thought it was a bad network cable: the tunnel opens but as soon as there is more trafic on it, it falls.

Actually, I wasn't so far: the device initiating the tunnel had the same IP than another device. The connection was not stable.

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