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I’ve noticed in a few situations where an ESXi host is marked as “unresponsive” or “disconnected” inside of vCenter due to issues occurring on that host (or connected hardware). This recently happened again with a customer and is why I’m writing this article at this very moment.
In these situations, usually all normal means of managing, connecting, or troubleshooting the host are unavailable. Usually in cases like this ESXi administrators would simply reset the host.
However, I’ve found hosts can often be rescued without requiring an ungraceful restart or reset.
In these situations, it can be observed that:
In the few situations I’ve noticed this occurring, troubleshooting is possible but requires patience. Consider the following:
If there are storage issues, do what you can. In one of the cases above, we had to access the ESXi console, issue a “kill -9” to the VM, and then restart the SAN. We later found out there was issues with the SAN and corrupted virtual machines. The moment the SAN was restarted, the ESXi host became responsive, connected to the vCenter server and could be managed.
In another instance, on an older version of ESXi there was an HPE agentless management driver/service that was consuming the ESXi hosts memory continuously causing the memory to overflow, the host to fill the swap and become unresponsive. Eventually after gracefully shutting down the VMs, I was able to access the console, kill the service, and the host become responsive.
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In my experience, the first thing to do when this happens is to log into vCenter via SSH (or Remote Desktop, if it's a Windows vCenter) and confirm that it can ping the host's management IP address. The second thing is to use nslookup to confirm that vCenter can resolve the host's FQDN correctly. (DNS problems will definitely cause connection issues between the vCenter and the host.)