VMware KB: Registering NSX Manager to vCenter Server or configuring the SSO Lookup Service fails with the error: nested exception is java.net.UnknownHostException

VMware KB: Registering NSX Manager to vCenter Server or configuring the SSO Lookup Service fails with the error: nested exception is java.net.UnknownHostException.
I have seen this error with customer installations. Even if you don’t run across the error, this KB contains very succinct instructions for troubleshooting basic infrastructure requirements for NSX Manager.