ESXi host disconnects intermittently from vCenter Server ...
kb.vmware.com › s › articleFeb 14, 2021 · ESX/ESXi host send heartbeats every 10 seconds and vCenter Server has a window of 60 seconds to receive the heartbeats. This behavior can be an indication of a congested network between the ESX/ESXi host and vCenter Server. Note: If the host disconnects every 60 seconds there is likely a firewall blocking UDP 902 heartbeats from ESXi host to ...