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Update Manager fails to update some hosts with an Unknown Error (2012244)

Update Manager fails to update some hosts and displays the message:

Unknown Error
The vmware-vum-server-log4cpp.log file (located in C:\Documents and Settings\All Users\Application Data\VMware\Update Manager or C:\Users\All Users\VMware\VMware Update Manager\Logs on the Update Manager server) contains errors similar to:

'HostUpdateDepotManager' 7692 ERROR] Unknown Host Error:
'SingleHostStageTask.SingleHostStageTask{155}' 7692 ERROR] [singleHostStageTask, 266] SingleHostStage: Unknown Host Error:

This issue occurs if a host cannot find the Patch Depot for updates.

To resolve the issue, update the PatchDepotUrl/> line in the vci-integrity.xml file:

Make a backup of the file C:\Program Files\VMware\Infrastructure\Update Manager\vci-integrity.xml.
Open vci-integrity.xml for editing.
Change the <PatchDepotUrl/> line to look like this:

<PatchDepotUrl>http://VC_IP:80/vci/hostupdates/hostupdate/ <PatchDepotUrl>

Where VC_IP is the IP address of your vCenter Server
Save and close the file.
Restart the Update Manager services. For more information, see Stopping, starting, or restarting the vSphere Update Manager service (1039328).

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