Can't mount client drives on my server core Mac

What settings have I screwed up so that I can “share screen” but not “connect as” to a powerbook on my home network? Other desktops and laptops are no problem. The MBP will hook up to other macs in the network and my NAS. Somehow or other my ROON software sees the files in the desktop . I suspect this is why I can’t include my client’s iTunes library as a watched folder in my core.

The client feeds my DAC and lives near the stereo. As things stand, if I want to play files off the client Mac, I have to switch to iTunes.

Macbook - OS 10.9.5 - wifi
Most others OS 10.10.5


David - Dallas