OPERATIONAL DEFECT DATABASE
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"Host connection and power state" alarm is raised for a host which heartbeat packets do not reach vCenter Server. This is normal behavior.After restarting vpxd, the host state is recovered to Green though the heartbeat packets from the host still do not reach vCenter Server.
This can occur by unsupported configuration that ESXi host and vCenter Server fails to communicate through the heartbeat port. The default heartbeat port is 902/udp.
The host which previously raised "Host connection and power state" alarm may appear to be healthy after restarting vpxd even though the heartbeat still does not reach vCenter Server..
Make sure that all required ports are allowed between ESXi hosts and vCenter Server or PSC.* Required Ports for vCenter Server and Platform Services Controllerhttps://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.migration.doc/GUID-F4F3E3DE-5DA2-49BE-BE4A-BFCA2EFF9FB4.html
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