ssh -Y is not an option

[ab2540@columbia.edu]

Hi
I'm trying to run some apps on our unix server remotely from a
windows XP box running cygwin/X.  I have read and re-read all the
posts and troubleshooting guides.  First ssh -Y is not accepted as
an option in the openssh I have installed second even following all
the instructions I get the following

$ DISPLAY=windows-jferrera:0.0 ssh -X nimbus
abarnes@nimbus's password:
Warning: No xauth data; using fake authentication data for X11
forwarding.
Last login: Fri Apr 29 15:44:14 2005 from windows-jferrer

As I said ssh -Y just gives
$ DISPLAY=windows-jferrera:0.0 ssh -X nimbus
abarnes@nimbus's password:
Warning: No xauth data; using fake authentication data for X11
forwarding.

Any clues ?

Regards
Anna