x11 cookie expires after some time

Emanuel Strobl emanuel.strobl at gmx.net
Fri Mar 18 12:14:56 PST 2005

Am Sonntag, 14. November 2004 19:28 schrieb Emanuel Strobl:
> Dear all,
> perhaps someone can explain me why I can't execute a x-program via a ssh
> session after some time (some hours). When I log into the machine
> everything is fine and xclock or any other x11 application is working fine.
> But after some hours, when I try to execute exactly the same application
> once again, I get the following error:
> Xlib: connection to "localhost:10.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Xlib: connection to "localhost:10.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Lost the connection to the X server
> The session wasn't interrupted nor did I modify anything else, just the ssh
> session has idled for some hours.
> I have to admit that I'm not really familar with the .Xauthority stuff, but
> it works for the first hour, so why not as long as the ssh session exists?

Here's some off-list communication, Paul Brooks told me that it's 
ForwardX11Trusted in ssh config.

Thanks a lot!

Am Freitag, 18. März 2005 20:35 schrieb Paul Brooks:
> On Tue, Mar 08, 2005 at 12:59:49AM +0100, Emanuel Strobl wrote:
> > Hmmm, I really can't remember what I did (if I did anything at all) but I
> > don't have this problem anymore. I'm sure I read something about the
> > cookie timeout, and played with xauth, but unfortunately haven't
> > bookmarked anything.
> > Sorry, I can't help you, perhaps there were modifications in RELENG_5 but
> > I don't believe that, just to note that I'm running 5.4-PRE now.
> >
> > I had a quick look at several config files and also couldn't find
> > anything special, just that I added (uncommented) "ForwardAgent yes"
> > in /etc/ssh/ssh_config.
> > If that's the solution, please drop me a note.
> Just a quick follow-up -- turns out ssh appears to have been the issue.  It
> wasn't ForwardAgent, but ForwardX11Trusted that appears to have fixed the
> issue for 5.3 release.

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