Update Manager broken after import Cisco VEM extension

Today I was working on upgrading some hosts in a vSphere 5 environment that is using Cisco Nexus 1000V virtual switches. I imported the extension bundle in Update Manager, created a baseline, and scanned the hosts. After a couple of seconds , I got a message in vCenter telling me the scan failed:

Scan entity <hostname> Host cannot download files from VMware vSphere Update Manager patch store. Check the network connectivity and firewall setup, and check esxupdate logs for details. Continue reading