WS2012R2 Failover TCP/IP settings stopped working for Ubuntu 1404 VM after host reboot

 

I experienced a very strange situation whereby the Failover TCP/IP settings in a Hyper-V VM's network configuration stopped working after the Hyper-V host was rebooted.

 

Hyper-V VM settings:

 

A planned failover had been carried out that same day and the server was accessible as expected during that day. That same night I carried out firmware updates on the host Hyper-V server for this VM. After the host server was rebooted, the VM was not accessible. I discovered the Failover TCP/IP settings where not 'sticking'.

 

Actual IP address (DHCP) vs network config file

The Ubuntu 1404.3 VM has a static MAC address (as per best practice).

I rebooted the VM and it happily took on the static IP address again and all was well.

Does anyone know why this might have happened?