This issue may occurs when vCenter is unable to install FDM agent in ESXi host due to any reason. If FDM agent is not exist, vCenter will generate below error:
Cluster will show error as "Cannot find vSphere HA master agent"
vSphere HA State in VC Console Summary Page will show error "vSphere HA State: Initialization Error"
vCenter will generate error while reconfiguring HA. "Cannot install the vCenter agent service. Unknown installer error"
Refer to below logs to analyze this issue.
Fix this issue by reinstalling FDM Agent.
- Remove existing agent by using below command.
esxcli software vib remove -n vmware-fdm
- Install new FDM agent by Reconfiguring HA on cluster.
- If Reconfiguring HA doesn't work, Remove Hosts from Cluster, and re-add it back. Enable HA on Cluster.