• Host is not responding though virtual machines are up and running.
   
• In the host logs, you may find similar errors:

2017-04-07T16:44:54.908Z info hostd[51580B70] [Originator@6876 sub=Snmpsvc] UpdateStats: report cimom converter stats completed
2017-04-07T16:45:01.364Z info hostd[51580B70] [Originator@6876 sub=Hostsvc.VmkVprobSource] VmkVprobSource::Post event: (vim.event.EventEx) {
--> key = 0,
--> chainId = 90705792,
--> createdTime = "1970-01-01T00:00:00Z",
--> userName = "",
--> datacenter = (vim.event.DatacenterEventArgument) null,
--> computeResource = (vim.event.ComputeResourceEventArgument) null,
--> host = (vim.event.HostEventArgument) {
--> name = "scentsy-esx03.sc-vmclus.local",
--> host = 'vim.HostSystem:ha-host'
--> },
--> vm = (vim.event.VmEventArgument) null,
--> ds = (vim.event.DatastoreEventArgument) null,
--> net = (vim.event.NetworkEventArgument) null,
--> dvs = (vim.event.DvsEventArgument) null,
--> fullFormattedMessage = <unset>,
--> changeTag = <unset>,
--> eventTypeId = "esx.problem.vpxa.core.dumped",
--> severity = <unset>,
--> message = <unset>,
--> arguments = (vmodl.KeyAnyValue) [
--> (vmodl.KeyAnyValue) {
--> key = "1",
--> value = "/usr/lib/vmware/vpxa/bin/vpxa"
--> },
--> (vmodl.KeyAnyValue) {
--> key = "2",
--> value = "2"
--> },
--> (vmodl.KeyAnyValue) {
--> key = "3",
--> value = "/var/core/vpxa-worker-zdump.000"
--> }
--> ],
--> objectId = "ha-eventmgr",
--> objectType = "vim.HostSystem",
--> objectName = <unset>,
--> fault = (vmodl.MethodFault) null
--> }
2017-04-07T16:45:01.365Z info hostd[51580B70] [Originator@6876 sub=Vimsvc.ha-eventmgr] Event 8869 : /usr/lib/vmware/vpxa/bin/vpxa crashed (2 time(s) so far) and a core file might have been created at /var/core/vpxa-worker-zdump.000. This might have caused connections to the host to be dropped.
Accepted password for user vpxuser from 127.0.0.1

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.