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The issue happens because rebooting the cluster node may take a long time, causing "Reconnect host" event to spam the vCenter console.

To prevent the said message:

Before starting the Prepare host command, manually set the ESXi host to Maintenance Mode.
Select No when asked to automatically reboot the host.
After the preparation, manually reboot the host.
Manually exit the Maintenance Mode when needed.

Keywords: reconnect host,too many event task,several instance of reconnect host,issue in esxi prepare

"Reconnect host" task appears multiple times during ESXi host reboot in Deep Security Manager

Deep Security 9.0

Last updated: 2025/05/08

Solution ID: KA-0006467

Category: Troubleshoot

During the preparation of ESXi host upgrade, Deep Security Manager (DSM) generates a lot of "Reconnect host" tasks in vCenter event log.

The issue happens because rebooting the cluster node may take a long time, causing "Reconnect host" event to spam the vCenter console.

To prevent the said message:

Before starting the Prepare host command, manually set the ESXi host to Maintenance Mode.
Select No when asked to automatically reboot the host.
After the preparation, manually reboot the host.
Manually exit the Maintenance Mode when needed.

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