ESXi and ESX hosts randomly disconnect from VMware vCenter Server Symptoms: VMware ESXi and ESX hosts randomly disconnect from VMware vCenter Server. The disconnected host alarm triggers. You are able to connect to a host using the vSphere Client and can manually connect the host to vCenter Server. In the vpxd.log file (located at C:\ProgramData\VMware\VMware Virtualcenter\logs), you see messages