Basically, the SSH client listens for connections on a configured port, and when it receives a connection, it tunnels the connection to an SSH server. Local forwarding is used to forward a port from the client machine to the server machine. See the SSH tunneling page for a broader overview. It can also be abused by hackers and malware to open access from the Internet to the internal network. It can be used for adding encryption to legacy applications, going through firewalls, and some system administrators and IT professionals use it for opening backdoors into the internal network from their home machines. ![]() SSH port forwarding is a mechanism in SSH for tunneling application ports from the client machine to the server machine, or vice versa. ![]() ![]() Contents What Is SSH Port Forwarding, aka SSH Tunneling? Local Forwarding Remote Forwarding Opening Backdoors into the Enterprise Server-Side Configuration How to Prevent SSH Port Forwarding from Circumventing Firewalls SSH's solution Further Information What Is SSH Port Forwarding, aka SSH Tunneling?
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