SSH Through NAT with help of middle man

With this method, you don’t need to do any modification on the middle man server. GatewayPorts setting is not required.

Run this on destination machine:

ssh -o ServerAliveInterval=60 -N -R <port on middleman>:localhost:<port on this machine, usually 22> <user>@<middleman server>

Run this on your local machine:

ssh -o ServerAliveInterval=60 -N -L <port on local machine>:localhost:<port on middleman server> <user>@<middleman server>

Then you can connect to localhost <port on local machine> which will take you to the destination server

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