SSH Port Forwarding Through a Proxy Server (Community-Submitted Tech Tip)

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Tutorial: SSH Port Forwarding Through a Proxy Server (Community-Submitted Tech Tip)

Learn how to use SSH port forwarding (tunneling) through a proxy server for secure connections.

Tutorial Details:

SSH Port Forwarding Through a Proxy Server

A common use of SSH is port forwarding (tunneling). This use causes traffic directed to a particular port to be sent to a specified port on another computer. Because traffic is sent through SSH, the traffic is encrypted, allowing the transmission of sensitive data through arbitrary services.

Example: Tunneling Connections From a Local Host on Port 8080 to Port 80 on a Web Server
The following command is an example that would tunnel connections from a local host on port 8080 to port 80 on the web server www.my-domain.com:

ssh -N -L 8080:localhost:80 www.my-domain.com
In the preceding command:

The -N switch prevents the creation of an interactive SSH session.
The -L switch accepts an argument of the form port:host:hostport, indicating that the local port is to be forwarded to hostport on the destination host. Therefore, the argument localhost is relative to www.my-domain.com, not to the machine at which you enter the command.

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