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Re: Sshd: problem with X11 passthru
- From: "David Picton" <djpicton at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Tue, 28 Mar 2006 10:17:03 +0100
- Subject: Re: Sshd: problem with X11 passthru
>From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
>To: cygwin at cygwin dot com
>Date: Tue, 28 Mar 2006 09:37:28 +0200
>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
>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
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