I'm not sure if this is the best place to get support for Cygwin, but a lot of the things are the same...
Anyway, when I SSH with ssh -XYC remote@192.168.1.104 to get into my machine, I can log in, but I can't start any X11 apps, even with my X server running.
Trying to start Netscape (perl /usr/bin/netscape/netscape ) gives me this error:
Also, whenever I try to open xterm (not in SSH) I get the error:
But at the same time, I can open xemacs.
Is there anything I can do to get my X server working properly?

what is $DISPLAY? also do you need to run xhost?
edit: sorry, i totally forgot it was with cygwin.

In cygwin, you need something like
X -query server
where server is the name of your linux box, to get an X login.

Google XDMCP for lots of info

You need to have the server configured to accept XDMCP requests. I think this is part of your gdm (or kdm or xdm or whatever display manager you are using) configuration. This is usually turned off by default because it is considered insecure.

Much easier, though not quite as flashy and smooth, is vnc, which gives you a remote desktop without using an X-client on your windows box (cygwin in your case). You need to start vncserver on the server, then use a client on your Windows box (I use tightvnc - it is free and open - I think). This can also be a more secure way, if you tunnel through ssh.

Not sure if the combination of -XY is the case try it with only -Y

Other thoughts if X is running then one can use a command like this.
export DISPLAY=:0

Or use the command ' xhost + ' but when done I would use the command ' xhost - ' to restore to a more secure enviroment.

Brian1

I apologise - I misunderstood what you were trying to do.

Rather than emulating X on Windows with CygWIN/X so you can ssh tunnel an X session over to your Linux box, have you thought about using FreeNX as an alternative?

It's one heck of a lot faster than tunnelling X or using VNC. Download the free Windows NX client from http://www.nomachine.com, and download the FreeNX server for your Linux box from http://freenx.berlios.de The FreeNX server may even be available as a package for your distro. NX uses ssh tunnelling itself, so it's secure. It uses compression of the X protocol for great speed improvement.

Are you trying to run this from the Cygwin command line? If so, you need to run it in xterm so it will have the DISPLAY variable set.

Or you can use another SSH client with X forwarding, like putty, and it will assume the display :0

As I had mentioned before, I can't start xterm, because it gives me a DISPLAY error.
Also, I tried FreeNX server, and it didn't work too well, so I went and downloaded the one from nomachine.com, and it works a bit better. I just get a connection timeout with their client from my laptop. I also installed the client in my VMwared PCLinuxOS install. I was able to connect perfectly from there... It probably doesn't help that I'm using Windows ME.
I'm going to search around a bit on sourceforge ad see if there are any open source clients.
I guess NX is my soloution to remote access, but I'd still like to get my X server working in Cygwin...

...........?

Is there a example of this type of setup somewhere?
What info are you following?

I think I am confused as to what you are after as well.
Brian1

Do you have the Cygwin X packages installed? In Cygwin, do "startx".

Alternately, don't use Cygwin and just use Xming which is the same X server without Cygwin.