Reverse Firewall issues?

[ericsouthga]

I have setup a Raspberry PI to allow me to use a reverse SSH tunnel to access it remotely. However, in my house it works fine, I have two different networks and firewalls, one is a 192 network the other is a 10 network, each has a different firewall.

But, once I take the raspberry and hook it up at my friends house and try to ssh back into the box, their firewall stops me. I know that they do not have port 22 open, and from what I read, that should not matter correct??

Thanks for any help.

[DeeJay]

Does your home broadband internet router have a configuration that allows connections from the public internet to reach devices on your internal networks? (It almost certainly does not by default.)

You probably need to research Port Forwarding (or Redirection) for your specific brand and model of internet router.

[Tarcas]

I have setup a Raspberry PI to allow me to use a reverse SSH tunnel to access it remotely. However, in my house it works fine, I have two different networks and firewalls, one is a 192 network the other is a 10 network, each has a different firewall.

But, once I take the raspberry and hook it up at my friends house and try to ssh back into the box, their firewall stops me. I know that they do not have port 22 open, and from what I read, that should not matter correct??

Thanks for any help.

If the Pi is reaching out of your friend's network to establish the connection from inside, you don't need his network to have the port open.

If you're connecting to it from elsewhere, you absolutely do need to open the port on his network.

Where are the source and destination of the SSH tunnel that you are establishing?