Assume you have a remote host with ip rhost_ip and user remote_user which you can connect by ssh (22 port).
Assume you need to connect from localhost to port 8080 (or any other), But you have no 8080 ports allowed/forwarded to public ip (rhost_ip).
In this case, you can forward it over ssh:
ssh -L 8080:localhost:80 remote_user@rhost_ip
This will start ssh session and make forwarding which will live with the session.
Then just connect to localhost:8080 and it will access you to remote host port 80.
Note:8080port should not be already used(binded) onlocalhostbefore run ssh command.
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