I have a host with Windows Server 2012 Datacenter for Hyper-V role. On this server was installed several VMs - Linux-based and Windows Server 2008 R2. Network config - host have 2 physical networ cards - manage_card with white IP and second_card for VM external virtual switch without IP. Now all VMs are conneting to the Internet from internal virtual switch, whose connected to 1st physical network manage_card with ICS (RRAS Server role need IIS - it's not applicable for me) and Microsoft Loopback interface.
Trouble, what I have - Windows Server 2008R2 can-t update with 80072efe error. After disabling firewall on host error changed on 80072ee2. And 1 moment - when VM check update I lost RDP connection to host.