How to create an ISO/NFS storage domain and attach it?

I've RTFM, searched the KB, and I still can't find anything on how to do this.  First, a bit of background:

The original ISO domain that was created during RHEVM install has been deleted, and so I need to create a new ISO domain.

I've installed all the requisite packages for NFS, created a directory, set the permissions on the directory to vdsm:kvm ownership, I've created an unlimited access(rw) directive to the directory in /etc/exports, and reloaded the NFS services.

When I try to either add a new domain or import an existing domain in the RHEVM interface, I'm receiving the very verbose error message Failed to add Storage Domain.

There's also something about an error code for the connection returned by VDSM was following General Exception.

I can mount the nfs volume on a linux workstation without issue.  The directory empty, so there's no metadata structures to modify.

Anyone have any ideas?

Thanks!

-Kermit Short