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VMware ESXi Server Down - Troubleshooting

1. VMware ESXi Server Down If your ESXi host is down/unreachable: Basic Checks Ping the host IP. Try connecting via vSphere Client / vCenter. Check if management network (vmk0) is up. Console Access Log in to the DCUI (Direct Console User Interface) on the server. Check if Management Network is disconnected. Restart Management Agents from DCUI. Hardware Issues Verify server power (PSU, cables). Check iLO/iDRAC/IMM for hardware alerts. Look for memory/disk/CPU failures. Network Issues Check NIC connectivity (link lights, switches). Verify VLAN & IP config. Storage Issues If datastore inaccessible → check SAN/iSCSI/FC connectivity. Verify LUN presentation from storage team. Logs & Recovery Check /var/log/vmkernel.log & /var/log/hostd.log. If corrupted, reboot host (after maintenance window). If ESXi fails to boot → check boot device (SD card/SSD).

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