X11 apps don't launch on F15 over ssh/vpnc

[FNB Mailing Lists]

Figured it out.  I was trying to set the MTU size via the iptables to 
1200.  I had previously tried setting INTERNAL_IP4_MTU to 1412 in the 
vpnc-script as per a redhat bug report 
<https://bugzilla.redhat.com/show_bug.cgi?id=693235>, but that did not 
fix it.  However, setting the value to 1200 resolves the issue.  I will 
now try values increasing between 1200 and 1400 and see where it stops 
failing.  Perhaps one of the updated packages is eating up more packet 
space than it used to.

On 08/21/2011 11:55 PM, FNB Mailing Lists wrote:
> I have been working on this all weekend and it appears something in 
> F15 has broken the ability to open an X11 app over ssh/vpnc.  It works 
> over ssh to another server on the local network, but it fails when 
> attempting to ssh over a vpnc connection to work.  This worked fine on 
> F14.  Just to double check I installed vpnc on an old F11 VM running 
> on an F14 host, vpn'ed to work, opened an ssh connection to a server, 
> and was able to open gedit.  The failing behaviour is that the gedit 
> window does not open and the verbose mode of ssh ends with the line 
> "confirm x11" before terminal window becomes unresponsive.
>
> Putting SELinux in permissive mode does not fix it.  Setting the 
> segment size to 1200 (one recommendation 
> <http://fixunix.com/x/19398-ssh-x11forwarding-wont-work-please-help.html>) 
> does not fix it.  I installed putty and it displayed similar 
> behaviour.  The only difference was that hitting return repeatedly 
> after the command resulted a couple of command prompts before it 
> froze.  I don't know whether it is the Gnome3, a bug introduced in F15 
> or vpnc or some other package.  If someone has any additional 
> suggestions I would be grateful.  Thank you.
>
>

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