Virtio drivers for WindowsServer 2012R2 network problems no outgoing traffic in Openstack

[Daniel Seybold <daniel.seybold@uni-ulm.de>]

Hi KVM developers,

currently I'm facing a tricky issue when I'm using the Virtio drivers
(Fedora [1]) for a WindowsServer2012R2 virtual machine on Openstack

I've created a WindowsServer Image following this tutorial [2]. I've
installed the virtio drivers  but without the Cloud-Init step.

I've created the Image in Openstack and started a VM.
I'm able to connect to the VM via powershell or remote desktop but I'm
not able to download any source from the internet.
I always receive a timeout.

Openstack Version: Kilo
QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-86.el7_1.5), Copyright (c)
2003-2008 Fabrice Bellard
virtio drivers: virtio-win-0.1.102

I've done the same steps on an older Openstack setup with
virtio drivers: virtio-win-0.1.96
and everything works without a problem.

Openstack Version: Icehouse
QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2-2.448.el6_6),
Copyright (c) 2003-2008 Fabrice Bellard
virtio drivers: virtio-win-0.1.96

It is definately not related to Openstack Security groups or netowork
issus on the host.
There is also a unix VM on the host without any network issues.

Does anyone have a clue how to solve this issue?

Thanks in advance for your help!

Cheers,
Daniel

[1] https://fedoraproject.org/wiki/Windows_Virtio_Drivers
[2] http://docs.openstack.org/image-guide/content/windows-image.html