View Full Version : Getting past the Firewall via SSH

22-02-2005, 12:27 PM

Im able to ssh out in to my home PC via port 22.
This is open at the firewall here and its great
I can then Tunnel VNC out via SSH, so I can view my home desktop

Not so with my mate.
He's got a no-ip.com account and it wont connect, even when he tries directly going to that IP?!
I can ssh into my home PC and then SSH into his home PC, but we dont wanna have to do that.

Any ideas what may be preventing it? Im running Gentoo, he's running Cygwin on WinXP



22-02-2005, 05:17 PM
Is he using the no-ip auto update program?

22-02-2005, 07:30 PM
Cached DNS records pointing to the wrong IP address?

22-02-2005, 08:07 PM
No, because when we try and connect to that IP directly (ping it from my place) it doesnt let it

I can connect to my place
I _dont_ use the NO-IP Dynamic Update Client (DUC)
I can then connect via my house to his, using either the no-ip.com addy or the IP
I cant connect from work to his place directly, using either an IP or a DNS Name (no-ip.com name).


22-02-2005, 08:07 PM
Oh wait.. I _can_ however connect to his PC from work on port 80 (his router).

Just not on port 22?

Murray P
22-02-2005, 08:29 PM
Oh wait.. I _can_ however connect to his PC from work on port 80 (his router).

Just not on port 22?

Firewall, NAT?

Would a new mate solve the problem :D

22-02-2005, 09:59 PM
What do you mean by "firewall, NAT?"?

Ive got enough mates at work... ;)

Funnily enough this is one of the few times Ive offered to help somebody there with a PC problem... Look what I get myself in to :p

24-02-2005, 03:18 PM
Who administers the firewall you are behind? Can you verify that the rule to allow port 22 out allows connections to anywhere?
Does the firewall at his house allow ssh connections from the work IP address?