connect behind from firewall

[Harold L Hunt II]

Michael,

Are you connecting via the -query command-line parameter to 
Cygwin/XFree86?  If so, XDMCP does not work when your XDM host is behind 
a firewall.  I am not sure if you can easily open the ports on the 
firewall or not.  In any case, the topic of XDMCP to hosts behind 
firewalls is one that is general to all X Servers and there should be 
lots of information about that on the web (search www.google.com).

If, on the other hand, you are using telnet to display applications 
running on the remote host, then all you need to do is instead use ssh 
with X11 tunnelling.  This is described for Cygwin/XFree86 in the User's 
Guide:

http://xfree86.cygwin.com/docs/ug/


This will require that you have the openssh package for Cygwin and that 
your Linux machine have openssh installed and the sshd daemon running. 
You will also need to have port 22 forwarded by the firewall to the 
Linux host.  You could also alternatively forward another port (for 
example, 2200) to port 22 on the Linux host if you already use port 22 
on the firewall.


Hmm... in fact, X tunnelling over ssh is also general to all X Servers 
with lots of information on the web.  Again, search www.google.com for 
more information.

Harold

szerdahelyi.mihaly@ln.matav.hu wrote:
> Hi,
> we would like to connect Win2k to Linux with cygwin; it works without
> problems when both machines are behind a company firewall but it does not
> work on this line: Win2k->comp.firewall->net->private router->private Linux
> server(same as in the first example). Unfortunately (but it is maybe good)
> we have not enough information about the firewall because of the policy. We
> can configure the end-machines and the private router. We could not find
> any ideas in FAQ's. Have you any idea what could we continue with?
> I send it in different mode because of the slightly confidential
> information.
> Thanks
> Michael Szerdahelyi