Public bug reported:

Network:
I have an Ubuntu desktop machine at home and also an Ubuntu 7.10 desktop 
machine at work.

I can connect to work from home using PPTP VPN (to a Windows 2003
Server). The VPN connection works fine - I can browse samba shares and
use sftp. I can SSH in to my desktop machine and use the command line
without any issues.

However, as soon as I attempt to launch a program which uses X11
forwarding the entire VPN connection immediately stops working, I can no
longer ping any machines at work.

I can connect to the machine with the X11 forwarding option without
issue (ssh [EMAIL PROTECTED] -X), the problem occurs when I run a program
(e.g. gedit).

Tested (as the client) using Ubuntu 7.10 and Hardy beta - same problem happens 
on both.
However, X11 forwarding from my Ubuntu desktop at work is fine if I connect to 
work from home using Windows XP with Putty & Xming.

Not sure if the problem is in SSH, or VPN.

** Affects: network-manager-pptp (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: network-manager-pptp (Ubuntu)
   Importance: Undecided
       Status: New

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SSH X11 Forwarding over PPTP VPN breaks connection
https://bugs.launchpad.net/bugs/205023
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