[clug] Why is my SSH port forwarding failing all of a sudden?
tony at lewistribe.com
Tue Feb 2 11:31:23 UTC 2016
On 02/02/16 22:18, Chris Smart wrote:
> This looks like you're sshing to localhost on port 55554, is that what
> is supposed to happen when you ssh to "remotehost?" Did you point the
> remotehost to localhost in /etc/hosts or something?
Sorry for the obfuscation.
There are three machines concerned: client, tunnel and server.
The client ssh (Cygwin) has a config like this:
LocalForward 55554 server.local:22
so I can "ssh -N tunnel" which translates to "ssh -p 12345 -L
55554:server.local:22 tunnel at tunnel.fqdn"
And once the tunnel is established I can "ssh user at serverlocal" which
translates to "ssh -p 55554 localhost", which should tunnel through the
established connection to tunnel.fqdn and establish a connection to what
the tunnel server knows as server.local
The config file is just to enable me to give shorthand names to mappings.
> Also, in the more recent reply above you said that regular SSH worked
> and that SSH *only* failed when you tried to forward ports (-L
> option), but that command is failing on regular SSH. So I'm a bit
> confused. Can you post the exact command you're using to ssh
> port-forward and just swap out the remote IP for "remoteip" and swap
> out the ip address of the machine you're forwarding ports to with
> "forwardip" or something? -c
So when I am home (no need for tunneling) "ssh user at server.local" just
works. It works from tunnel and it works from client.
Hope that clears things, and I appreciate the help so far.
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