Bug#691844: xauth: Failed X11 forwarding when using GDM via XDMCP

Julien Cristau jcristau at debian.org
Sun Nov 4 00:01:12 UTC 2012

On Tue, Oct 30, 2012 at 10:41:35 +0100, Stefan Voelkel wrote:

> Package: xauth
> Version: 1:1.0.4-1
> Severity: normal
> Tags: upstream patch
> When using GDM via XDMCP, for examle when accessing GDM via
> vncserver->XDMCP->localhost, ssh is no longer able to forward X11.
> 	Invalid MIT-MAGIC-COOKIE-1 keyxterm Xt error: Can't open display:
> 	localhost:10.0
> The problem is, that xauth is unable to deal with the Family "FamilyWild" which
> is used by GDM in XDMCP to store the MIT-MAGIC-COOKIE-1 for the user.
> Attached are two patches, one for 1.0.4-1 and one for 1.0.7-1. The original
> Patch is by Dr. Tilmann Bubeck.
> Upstream Bug is at
> 	https://bugs.freedesktop.org/show_bug.cgi?id=43425
> FWIW, Redhat also has a bug for this:
> 	https://bugzilla.redhat.com/show_bug.cgi?id=505545
Why does gdm do that?  How is that not a gdm bug?

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