X11 remote networking problems

[cobra01977]

I'm trying to connect to my university's linux server via ssh, all is well except when I want to use an application that isn't command line based and requires an X window, when I use it on the university internal network it's fine and I suspect it now doesnt work because I'm behind a NAT firewall, how can I get around this (preferably while still using NAT)

 

[cube]

ssh -X

 

[cobra01977]

ssh -X

no I always use that on my login, when i start an x application is says "" display not found

 

[cobra01977]

I think it's because my computers ip address can't be seen (due to NAT)

 

[cube]

The server does see an address, that given by the router.

 

[cube]

Does the server have "ForwardX11 yes" in /etc/ssh_config ?

 

[mkrishnan]

Do you not have to still set the server display environmental variable if you use ssh -X, as you used to have to with telnet? I'm not sure -- I'm just asking.

 

[cobra01977]

I've solved it now, I opened the X server port on my firewall, it works, just slowly

 

[cbiffle]

Then they probably have X11 forwarding disabled on the server.

The -X option on ssh forwards the X traffic back through the ssh connection itself -- you shouldn't have to open a port on your firewall.

 

[cube]

Do you not have to still set the server display environmental variable if you use ssh -X, as you used to have to with telnet? I'm not sure -- I'm just asking.

No. ssh does it

 

[cobra01977]

Then they probably have X11 forwarding disabled on the server.

The -X option on ssh forwards the X traffic back through the ssh connection itself -- you shouldn't have to open a port on your firewall.

well I opened the ssh port and x windows actually and it worked after that

 

[cube]

well I opened the ssh port and x windows actually and it worked after that

You are not forwarding. The ignored -X option is not needed.

 

[cobra01977]

You are not forwarding. The ignored -X option is not needed.

Ah, I see thanks

 

[cube]

I was looking for how to use the -R option. Here it is:

http://www.brandonhutchinson.com/Forwarding_X11_traffic_without_X11Forwarding_yes.html

Now you can close the X11 port in the firewall again.