Addition to FAQ 6.1 - X11 forwarding and xauth

[Jon TURNEY]

Wheeler, Frederick W (GE, Research) wrote:
> I have an additional answer to Cygwin/X FAQ 6.1, "X11Forwarding does not
> work with OpenSSH under Cygwin"
> 
> --- begin ------------
> 
> A6:
> 
> If the *remote* machine is a Windows machine using Cygwin OpenSSH,
> make sure the Cygwin xauth package is installed on the *remote*
> machine.  The OpenSSH server needs xauth to do X11 Forwarding.
> 
> --- end ------------

Added, thank you.

> For a while I was confounded by this:
> 
> % export DISPLAY=:0
> % ssh -Y -f remote-windows-host printenv DISPLAY
> Warning: No xauth data; using fake authentication data for X11
> forwarding.
> *** DISPLAY not printed here !!! ***
> % ssh -Y -f remote-unix-host printenv DISPLAY
> Warning: No xauth data; using fake authentication data for X11
> forwarding.
> localhost:21.0 *** DISPLAY printed as expected ***
> 
> I finally noticed a message about xauth in the output of
> 
> ssh -vvv -Y -f remote-windows-host printenv DISPLAY
> 
> This was hard enough to diagnose that I think it deserves the FAQ
> entry above.


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