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X11 forwarding currently doesn't even attempt to authenticate with the local X server. In order for it to do so, PuTTY would have to know where to look for authentication data. It would be nice if this were to happen.
A simple approach might be for PuTTY just to pass on authentication
data supplied by the X11 client if it has no better ideas. The X
Protocol Manual suggests that servers should ignore any authentication
they aren't expecting, so this shouldn't break anything that currently
works, and it would allow the user to copy back PuTTY's cookie to their
real X server.
SGT, 2003-01-14: A couple of days ago I built in the
infrastructure for this, since X forwarding in the Unix port of
Plink is virtually useless without it. The platform-independent X
forwarding code now has the ability to talk either of
to the local X server, provided a platform-specific function tells
it what authentication cookie to use. So it's still not actually
supported on Windows (since the Windows version of this function
does nothing), but the amount of work that would need to be done to
support it is now minimal.
Audit trail for this wish.