An ESXi 6.x host in the vCenter Server inventory has disconnected due to an All Paths Down (APD) situation. An administrator has corrected the APD issue on the host, but it still remains…

Selecting 'Restart Management Agents' from the DCUI restarts the hostd and vpxa services on the ESXi host, which resets the management plane and forces the host to re-register with vCenter Server. This is the standard recovery procedure when a host remains in a disconnected state after the underlying storage or network issue has been corrected. The DCUI is accessible directly on the host console regardless of the host's connectivity state with vCenter.

The esxcli command 'esxcli system settings advanced set -d /Scsi/FailVMIOonAPD' controls VM I/O failure behavior during an active APD event and does not address reconnecting a host to vCenter after the APD has been resolved.

Modifying /Disk/ApdTokenRetryCount adjusts the number of retries the storage stack attempts during an APD condition, which is a tuning parameter for APD tolerance rather than a post-recovery reconnection step.

Enabling /Misc/APDHandlingEnable activates the APD response feature on the host for future events; it is a configuration toggle, not a method to reconnect an already-disconnected host.