Trouble with LINUX server with VPN

At the office, people are able to connect to a RedHat LINUX box and
open up a LINUX remote desktop on their windows machine. They just use
CygWin and type

$ X -query machine_name

and they then get a graphical login screen to the Redhat LINUX box.

Unfortunately, I am located outside the office and connect to the
office using OpenVPN shareware on my WinXP notebook.

I can start cygwin and am able to ping the machine. When I try

$X -query machine_name

I just get a blank gray window opening up with no login screen.

Can someone give me some broad hints as to solve this problem?

Is it configuration files in RedHat LINUX that need to be modified?

Is it ports on the LINUX box that have to be opened? If so, which ones?


Note that within the office network, everything works fine. I think
packets are getting lost when VPN is used.

thanks for any hints that you can give!

jeanluc wrote:

......
> Note that within the office network, everything works fine. I think
> packets are getting lost when VPN is used.
>
> thanks for any hints that you can give!
Are the incoming and outgoing external ports open at the office for vnc?

David Gurvich wrote:
> jeanluc wrote:
>
> .....
> > Note that within the office network, everything works fine. I think
> > packets are getting lost when VPN is used.
> >
> > thanks for any hints that you can give!
> Are the incoming and outgoing external ports open at the office for vnc?

It looks like the vnc ports are closed.

I decided to drop the requirement for just an XTERM rather than a
complete remote LINUX desktop. This is better on the LINUX resources
anyways. The cygwin commands to do this are

$ startxwin.bat

This opens up an XTERM window. In this new window I typed

$ ssh -Q account_name@machine_name

If I then type "xclock", a clock then appears on my windows desktop.