Have had this issue more than once. The host server is patched and/or rebooted and when it comes up the VM is off the network. Tried combinations of rebooting the VM and host server and that did not work.
All Windows 2008, host has 4 nics, two teamed for the network and two teamed for the hyperv network. Both teams use network fault tolerance only.
To fix the issue you have to shut the VM off, go into virtual network manager and remove the network for the VM's, re-add the same exact network, edit VM settings to use the network even though its the same one technically, start VM and then it comes online.
Any ideas what causes this to happen or what we can do to permanently fix it?
Note: This does not seem to be related to the hotfix issues with VM losing network connectivity since it only happens after the host is rebooted.