Bullshit! The Setup was correct all the time. I'm using three different types of proxmox servers, in different areas, since more than a year. Never had any problem. Everything worked. That's why i put so much energy in this project. At this point it's not my task anymore to figure it out. It's my task to find a economical solution and now the cheapest solution is(if it works - will be tested soon) to install WServer 2012 on bare metal and use hyper v.