To resolve this issue:
- Disable HA on the cluster.
- Select the host and click the Configuration tab.
- Click Security Profile.
- Click Properties and check the status of vSphere High Availability.
- Start the service if it is stopped.
- Enable HA on the cluster. You should now be able to reconfigure HA.
Note: If jumbo frames are configured then make sure you are able to ping the vmkernel with a minimum of 9000 packet size. For more information see,