Trusted vs untrusted ssh/X connections

[Andrew DeFaria]

This is something that's been bothering me for a long time and I thought 
I might look into it a little deeper. I'm not sure if I should post this 
here because it involves Cygwin/X but it also involves OpenSSh.

When I ssh into a Linux machine using ForwardX11 I get those familiar 
messages:

Warning: untrusted X11 forwarding setup failed: xauth key data not generated

and according to 
https://cygwin.com/ml/cygwin-xfree/2008-11/msg00154.html: The warning 
can be silenced by using ssh -Y, since that
is what ssh -X is doing now anyway.

However, I find -Y to be 20 times slower to log in than -X:

Adefaria-lt:time ssh cm-job-ldev01 echo 'hi'
Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Warning: No xauth data; using fake authentication data for X11 forwarding.
/usr/bin/xauth:  error in locking authority file /home/adefaria/.Xauthority
hi

real    0m2.387s
user    0m0.075s
sys     0m0.446s
Adefaria-lt:time ssh -Y cm-job-ldev01 echo 'hi'
Warning: No xauth data; using fake authentication data for X11 forwarding.
hi
/usr/bin/xauth:  error in locking authority file /home/adefaria/.Xauthority

real    0m22.476s
user    0m0.091s
sys     0m0.477s
Adefaria-lt:

Bonus points if you can help me get right of the other errors!
-- 
Andrew DeFaria
http://defaria.com


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