On Mon, 2008-06-23 at 13:06 -0400, Rick Bilonick wrote: > How do you explain that this works fine when going from my home computer > to an account on my ISP's computer? I followed an example posted on the > web (which DID have one mistake in using "localhost" which I corrected - > but the other use of "localhost" is AFAIK correct). In order to do a > reverse tunnel, don't you have to point to localhost in order to use the > forwarded port? > > I don't see this as confusing: > > (on my.work.server which is behind a firewall that blocks incoming ssh > but not outgoing ssh) > > > ssh -R 2022:my.work.server:22 me@xxxxxxxxxxxxx > > where "my.work.server" is the IP address for my.work.server and > "home.computer" is the IP address for my home.computer. This sets up the > port forwarding for a reverse tunnel (that's the -R option). If on > home.computer I do: > > > netstat -an | grep 2022 > > it shows that home.computer is listening to port 2022. > > Then, to use the reverse tunnel (again on home.computer): > > > ssh -p 2022 accnt@localhost > > where "accnt" is the user account on my.work.server and I use the > password for accnt on my.work.server. This should allow me then to go > through the ssh tunnel in the reverse direction (getting through the > firewall that is blocking the use of incoming ssh from the home computer > to the my.work.server). > > Even after removing everything in hosts.allow on my.work.server, I still > can't connect. > > This SAME set up works fine if I set up the tunnel from my home computer > to my account on my ISP's server. And yes I'm using "localhost" similar > to what I show above. And I've tried it from my.work.server to my > account on my ISP but have the same problem so the problem is something > on my.work.server. > > Is it possible for the firewall to block a reverse tunnel (without > blocking outgoing ssh)? > > Rick B. > One more thing. I just tried this on another Fedora 8 computer hooked to a different network (at the same organization) that has a fire wall blocking incoming ssh. I followed the same strategy as outlined above and it works like a charm. So this procedure DOES work as I've outlined it above IN PRINCIPLE. For some reason, it doesn't work on the other server. Rick B. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
