We have 3 hosts in a 5 node cluster that bring up the "Host has an agent that is not in a responding state and is not available for placement" error when we try to live migrate a VM. We have following the troubleshooting steps listed below and cannot fix the error. The hosts can be refreshed without error and the status is all green in the properties. The VM's can be successfully migrated using the cluster administrator.
Verified the firewall is not blocking any traffic
Rebuilt the performance counters
Repaired/rebuilt WMI
Re-installed the OS on one of the nodes and rejoined to the cluster
Removed and reinstalled the scvmm agent
SCVMM 2012 R2
Windows 2012 Hosts