X over ssh

[dman <dsh8290@rit.edu>]

This isn't really Debian related, but I'm having some trouble with X
over ssh.  I am at a win2k box with XWin32 running (& access control
disabled).  I use ssh (from cygwin) on that box to login to a FreeBSD
box (our webhosting server).  The DISPLAY variable is correctly set,
but whenever I try to run an X app I get :

    $ xterm
    Xlib: connection to "redoaksw.com:10.0" refused by server
    Xlib: Invalid MIT-MAGIC-COOKIE-1 key
    xterm Xt error: Can't open display: redoaksw.com:10.0

    $


On the client (windoze) side :

    $ ssh -V
    OpenSSH_2.5.2p2, SSH protocols 1.5/2.0, OpenSSL 0x0090600f


On the server (FreeBSD) side :

    $ telnet localhost 22
    Trying 127.0.0.1...
    Connected to localhost.
    Escape character is '^]'.
    SSH-1.99-OpenSSH-2.1


Why might the cookie be invalid and how can I correct it?

TIA,
-D