Sometimes it isn’t working out because the ESXi host just can’t see vCenter Server behind NAT: Once it doesn’t receive heartbeats from the host in 60 seconds, vCenter Servers marks this ESXi as Not Responding and eventually Disconnected. The tricky thing about vCenter is that the ESXi host sends heartbeats, and vCenter Server has a window of 60 seconds to receive the heartbeats. Verify that you can connect from vCenter Server to your ESXi host To do so, just initiate a ping test from your ESXi host: The next step is verifying that network connectivity exists from vCenter Server to the ESXi host (both with the IP and FQDN)Īlthough it seems obvious, you’ll be surprised to find out how many people actually forget to do it beforehand. Errors that you’re likely to get might just explain what exactly went wrong: It won’t hurt if you run Test Management Network as well. As for the restarting the Management agents – you can look it up here. This service is responsible for synchronizing VMware components and granting access to the ESXi host through the vCenter Server. Now, in case the ESXi host is powered ON but still shows as Not Responding, try restarting the Management agents (Restart Management Network) When the host is booted, add it to vCenter Server for a second time. If that’s the case (I hope not), you’ll have to deal with this issue according to this VMware KB article. The problem is, your host might have met the infamous PSOD (Purple Screen of Death, AKA Purple Diagnostic Screen). It would help if you made sure it is turned on both physically in the rack and is available via remote console (iLO/iDRAC). A lot of things can cause this, so, today, we’re going to take a look at the most frequent ones.įirst of all, verify that the ESXi host is in a powered ON state I don’t consider an exaggeration to say that each VMware vSphere admin at least once has had one or several VMware ESXi hosts were showing as Not Responding in vCenter Server. StarWind Virtual Tape Library (VTL) OEM.StarWind Virtual Tape Library Appliance (VTLA).StarWind RDMA Performance Benchmark (rPerf).
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