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I am trying to setup an ssh server, and I can ssh locally with pubkey authentication, but when I try using the server's public ip, I cannot. I checked this website to see if the port was really open or not, and it was. I checked if there was a firewall and there doesn't seem to be any.

[jacob@cooler ~]$ ssh -vvv -p 22 user@ip) OpenSSH_7.9p1, OpenSSL 1.1.1b 26 Feb 2019 debug1: Reading configuration data /etc/ssh/ssh_config debug2: resolve_canonicalize: hostname (ip) is address debug2: ssh_connect_direct debug1: Connecting to (ip) [(ip)] port 22. debug1: connect to address (ip) port 22: Connection timed out ssh: connect to host (ip) port 22: Connection timed out [jacob@cooler ~]$ ^C

When I use the lan ip(using the same machine as the same client), it works. Changing the ip to the public ip does not. Any advice is welcome!

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    You are trying this from inside the lan? You are probably just experiencing your routers lack of NAT Hairpining functionality. Try from a hotspot or a friend's connection. Commented Mar 23, 2019 at 17:31
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    Oh. I tried that and it worked. Apparently the hours of research I did never brought that up. Lol. That was it! ha ha. Commented Mar 23, 2019 at 20:39
  • Would be good to mark answer as accepted (your own also), if it solve Your problem. Commented Mar 23, 2019 at 20:58
  • @MikhailMoskalev, I have to wait two days apparently before I can accept. Anyone want to give me upvotes? I feel like if this had been more popular, there would be less time wasted by people with problems like me! Thx! Commented Mar 23, 2019 at 21:33
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    Possible duplicate of Unable to access outside service from inside LAN Commented Mar 23, 2019 at 22:09

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Apparently, some routers cannot deal with a computer on a lan network accessing the public server located in the same lan, called NAT Hairpining. If you think you have everything setup for ssh (the port is open, there is no firewall), try logging in from a different network. Thanks to Tim_Stewart!

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