Xlib: No protocol specified (connection refused by server)

["mielikki1" <mielikki1 at subdimension dot com>]

I just installed cygwin (version 2.125.2.10) and xfree
(4.2.0) and have run into a problem. It seems to work okay
locally (that is I can start the server and launch new
clients from my xterm window whether DISPLAY is set to
127.0.0.0:0 or my real IP address), but when I try to start
a client on a remote Red Hat Linux machine (over the
Internet or through a VPN) I get the following error:

  Xlib: connection to "x.y.z.t:0.0" refused by server
  Xlib: No protocol specified
  Error: Can't open display: x.y.z.t:0.0

I am running Windows ME and Zone Alarm. I get the same
problem if I turn Zone Alarm down to Low or even shut it
down. I can ping my Windows machine from the Linux box.

I couldn't find anything searching the archives here and
various Web engines.

Any thoughts? Any tests to try to narrow it down? I guess
I'll figure out what ports the X server is listening on and
see if I can connect to them...
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