DVS DvsPortset-n has 1 shadow or zombie port
This issue occurs due to the ESX or ESXi host was participating in a Distributed Virtual Switch on the previous VirtualCenter. The ESX host maintains local record of the DVS, and this conflicts with the new VirtualCenter configuration.
The issue is resolved with ESX/ESXi 4.1 Update 2 VMware ESXi 4.1, Patch ESXi410-201110201-SG Updates the VMware ESXi 4.1 Firmware (2002339)