8/3/2023 0 Comments Putty ssh tunnel localhost![]() Yes, you can do that, but if you don't understand how it works, it is easy to make incorrect assumptions. Only -L can open a publicly accessible port if you add the address binding field.Otherwise if -L, then the context is taken at the ssh server's LAN. The context of other_host is taken from the ssh client's LAN if -R is used. The trick for easy understanding this topic is to think that the ssh client and the ssh server belongs to two different network LANs. Two major confusion is the use of -R versus -L.As ssh is tcp-based connection-oriented communication protocol therefore, you will need other tools in combination such as nc or socat to forward UDP ports.In this cases, the error messages are printed in the ssh client console. The command nc -w 5 -z localhost 1234 always succeeds inside even if there is no listening port in the other_host or even if other_host is non-existent at all.Meaning that, if you check for port opening by nc -w 5 -z 12202 & echo "open" || echo "close" then you will see the close message printed as the port is only accessible inside. Despite you setup a listening tcp port 1234 inside, but this not publicly accessible in. ![]() There could be a machine with similar ip address of 192.168.1.69 within 's reach in terabithia's network LAN, but that is not the other_host that is being referred to in the above snippet. Then, you better be sure that 192.168.1.69 is pingable from your end ( the ssh client). Because the ssh client and the ssh server could be in two different LAN networks.įor example: ssh -R 1234:192.168.1.69:4321 ^ Same, http server needed to go out via my office's http proxy too!Īnd then I can visit the http server from SSH server via localhost:12345īUT you need to understand, that this other_host that you will be specifying is at the context of the LAN network of the ssh client. ![]() However, in the SSH server I can visit the website by Attched setting and result at below. I have tried to make the reverse tunnel from the http server directly. Is that affecting the reverse tunnel behavior? In the device that I am running SSH command, I am going out with via a proxy server. The result that I try to access the tunnel from the Destination (SSH Server): Tunneling config (the Dynamic one is for the Socks5 connection, please just ignore it the R12345 one is the tunnel that I am playing with): 192.168.1.132:8081 is a working web server with a contented page, but I got ERR_EMPTY_RESPONSE when I visit localhost:12345 (I set port 12345 as the source port) from the client device. However, may I know is it make sense to input other host such as 192.168.1.132:8081 into the Destination field? Most of the tutorials are teaching me to forward remote port to localhost port. On the server with tcptrack I can see some connections popping up but resetting on the loopback interface when trying to connect from the client and they disappear after 1-2 seconds.I am using Putty to achieve SSH Reverse Tunnel Port Forwarding. So I've set up putty on the client with a local port forwarding to the remote. Sshd: error: connect_to port 27017: failed. On the server, in /var/log/auth.log I get when trying to connect: When trying to connect to the database from the client however I get connection refused. I have no problem using the database server locally from within the server. Now I have a MongoDB server running on the server which I want to connect to from my client but I don't want the server exposed more than necessary (it's not meant for public use anyway) to the internet so I want to use my SSH tunnel and forward the correct port trough it. I'm on a Windows 10 client and can successfully connect to my Ubuntu 16 server with putty over SSH, including with a keypair. I'm having trouble connecting to a remote database server.
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