VMware vCenter 5 – NFC Server error

Issue

NFC Error

In vSphere 5 we moved an ISO from a local drive to a datastore using the VMware Infrastructure Client. Upon instigating the upload it immediately failed.

Error message :  Failed to log into NFC server.

Possible DNS issue with servers for the host?

Solution:
We found missing DNS entries for the ESXi hosts. The servers specified were referencing DNS IP addresses that had no entries for the ESXi hosts being administered.