Sometimes Hyper-v host managed by VMM is working fine and suddenly you see host
report that "VMM is not able to refresh VMs placed on that host"
In case that you have VMM Cluster you have to make sure that both nodes has WinRM
Service configured correctly and the same in all Hyper-v hosts . In this case the Second node in VMM Cluster the WinRM service was not configured. Simple run command WinRM
Quickconfig and all errors disappear