Access Webserver Behind Firewall

• Last modified: tor apr 30, 2020 04:47
• Sign: JN
• Tested on: Xubuntu
• Solved: Yes

(Note: Feedback and testing from other users are most wanted, and welcomed!)

If you want to access an URL on a webserver behind the NRM firewall using your web browser, you can do this using "dynamic application-level port forwarding" (ref. 1) in ssh.

What you need is an account on cc.nrm.se (see SSH), and a browser capable of using a SOCKS proxy (ref. 2).

Here is an example using Googles Chrome browser on Ubuntu GNU/Linux:

1. First, start an SSH-session to a computer behind the NRM firewall, asking to set up a port for the web browser:

    [home] $ ssh -D9090 galaxy
   

2. Then, start your browser, telling to use the port as proxy:

    [home]$ google-chrome --proxy-server="socks5://127.0.0.1:9090"
   

3. Point your browser to a URL only accessible for computers beind the firewall!

4. After quitting the chrome-browser, don't forget to close the SSH connection!

References

1. https://superuser.com/questions/408031/differences-between-ssh-l-to-d
2. https://www.linuxbabe.com/desktop-linux/configure-proxy-chromium-google-chrome-command-line