Hyper-V Live Migration: Error Applying Changes

Today I came across an error when enabling Hyper-V Live Migration on a node in my cluster (Hyper-V Server 2012)
It read: “Error applying Live Migration changes. Failed to modify service settings.”

After a bit of digging I found a solution. Strangely enough all I had to do was the following:

This was performed on a Hyper-V Server 2012 installation, but i presume this would be exactly the same for Server 2012 Core and Server 2012 GUI. With either PowerShell or a cmd.exe window do The following.

  1. Navigate to C:\Windows\System32\GroupPolicy\Machine on the server in question
  2. Delete the file “Registry.pol
  3. Try to enable Live Migration again

After i deleted Registry.pol i was able to start the Live Migration service and migrate a VM. I wasn’t required to restart the server.



A picture of the error for your convenience



  1. says

    I wouldn’t have believed it if I hadn’t seen it, but this is absolutely the solution to my exact same problem.
    I was building a 2 node cluster, and for some reason the older of the 2 systems had this problem.


  2. says

    Had to cold boot one of our hosts (4 node) due to a system hang, and after that the server suffered this exact problem. When I found that VMMS wasn’t listening on a port that lead me to look at the host LM settings, which were un-ticked. Ticking it lead to the ‘error applying live migration changes’ message.

    This fixed it for me. Thanks a lot!!

  3. Tristan says

    Thanks very much. Spent most of the day trying to troubleshoot this one and couldn’t believe this is what fixed it.


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