RE: X thro ssh
Saravana Kumar wrote:
STYMA, ROBERT E (ROBERT) wrote:
>>
>> Hi fellow admins,
>>
>> I posted to this fedora.desktop and was redirected.
>>
>> I have a peculiar requirement. We have two offices. People from second
>> office(say #2) want to connect to the server in first
>> office(say #1). They
>> want to run the GUI applications in the office #1 server from
>> office #2.
>>
>> I tried to do this with VNC server and it works fine. But VNC
>> is goes thro
>> unencrypted(open) connection. Is there a way to do this in a secured
>> way(read that xdmcp is not possible as it uses UDP).
>>
>> Inside our network(LAN) if connect from one system to other
>> thro ssh and
>> start an gui application that application shows up in the client. This
>> doesn't happen when i connect to server and start gui
>> apps(says display not
>> set). iptables runs in the server. Do i have to open any port
>> for that?
>>
>> Any help or pointer in this regard is appreciated.
>>
> You can use port forwarding within SSH to accomplish this
> task with VNC. In a nutshell, you port forward some port near 5900
> (the vnc port) on the local machine to port 5900 on the machine
> running the vnc server. This is done in your ~/.ssh/config file.
> For example:
> LocalForward 5925 192.168.0.5:5900
>
> You then run:
> vncclient localhost:25
> and it will connect through the secure tunnel to port 5900 on the
> target machine. In the example 192.168.0.5
>
> For X, the task is even easier. Run:
> ssh -X -Y remote_machine.my.domain
> (where remote_machine.my.domain is the other machine)
> and X will be forwarded back to the local machine.
> If this does not work, check the /etc/ssh/sshd_config to
> make sure X11 tunnelling is allowed. (search for X11 in the file).
>
> Bob Styma
>
Thanks For the help Bob.
Let me put on what i did from first.
In the beginning(before posting here) i took two systems(rose & glob) to
test how this works. Both are FC4 systems and the default(X11Forward yes
in sshd_config) is unchanged. I connect from rose to glob thro ssh(ssh
rose.mydomain.com) and say xclock the app shows up in rose. But when i
connect from glob to rose thro ssh(ssh glob.mydomain.com) and say xclock
it wont work. This is annoying. Any idea where i am going wrong. As both
are inside lan there is no firewall in them. i can connect in text mode
from each other.
I am going to try what you said in a short while and post the results
here.
Thanks Again,
regds,
SK
Sorry in glob ForwardX11 yes was not enabled in the ssh_config. Now
everything works fine from both systems. And hey it works without
specifying -X, -Y options.
Just to add up in both machines vncserver is not running.
regds,
SK