unable to log into VMware Server

[Theodore]

I am trying to log into either the VMware vSphere Hypervisor 4.1 or VMware Server 1.0.4, but I am having difficulty making a connection.

I receive messages such as Network failure: Host address lookup for server XYZ failed: No such host known / The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for.

There is no place for specifying the port. I have tried installing the SDKs for both versions of VMware in use.