VPN stops working on launch transmission

[localhost]

As soon as transmission is started, my active openVPN connection stops working. If I open up transmission first, a openVPN cannot be started. This goes voor the GUI VPN connection as well as the terminal VPN connection.

I've got no clue what's causing this. Only thing I know is this stopped working sometime after upgrading to the current 15.04 alpha.

$ lsb_release -rd
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04

$ apt-cache policy transmission-gtk
transmission-gtk:
  Installed: 2.84-0.2ubuntu1
  Candidate: 2.84-0.2ubuntu1
  Version table:
 *** 2.84-0.2ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: transmission-gtk 2.84-0.2ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
Uname: Linux 3.19.0-10-generic x86_64
ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar 24 21:26:02 2015
InstallationDate: Installed on 2014-07-07 (260 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: transmission
UpgradeStatus: No upgrade log present (probably fresh install)

[localhost (localhost-gmail)]

Seems the bug is not valid as I submitted it. I just installed Deluge to see if that causes the same issue. It does.

So it is some sort of networking issue.