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Re: Sshd: problem with X11 passthru
On Mar 28 10:17, David Picton wrote:
> >From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
> >On Mar 27 18:55, David Picton wrote:
> >> I have encountered a problem with the sshd server when the client
> >> specifies X11 passthru i.e. ssh -Y or ssh -X.
> >> The allocation of virtual displays doesn't work correctly if two or
> >> more X11-enabled sessions run at the same time.
> >> As I understand it, the server should give each session a unique
> >> display number under these circumstances: localhost:10.0,
> >> localhost:11.0, localhost:12.0 etc.
> >> Instead, all the sessions have DISPLAY=localhost:10.0 at the same
> >> time. This causes a variety of problems - loss of access to the X
> >> server (due to changed Magic Cookie authorization on the server when a
> >> new client connects), or the appearance of windows on the wrong server
> >> (if two different clients connect).
> >> (Note that setting up Magic Cookie authorization on the client machine
> >> makes no difference to this bug. It prevents the client-side warning
> >> about 'fake authorization' but it doesn't cure any of the server-side
> >> problems!)
> >I don't see anything Cygwin specific here. You should ask your
> >question on a mailing list or newsgroup dedicated to OpenSSH.
> Apologies for not making it clear that I was talking about the Cygwin
> port of sshd.
> The bug seems to be specific to the Cygwin version and I've not seen it on other
Well, the problem is this. I just tried it and I can't reproduce it.
Each session gets another display number, starting at 10, as expected.
Maybe this is somehow due to a sshd_config setting which uncovers a
sshd problem? I don't see how this should be related to Cygwin. I still
think this should be a question for a ssh mailing list.
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
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