Newbie Needs Help: no connection

[WinslowSchiller]

Hello: I recently acquired a second Mac Pro (my "B" unit) to work alongside my A unit (another Mac Pro running Digital Performer as my main DAW). They are networked via Ethernet and both running High Sierra. I can use Midi over the network to control stand alone plug ins on the B unit from the A unit. I've installed AudioGridder as Server on the B unit, and I can insert the AudioGridder plug in on my A unit. However, I'm not getting any connection. I know I'm getting network connection over Ethernet in general with network MIDI, but AudIoGridder won't connect. Ideas? Thanks. - Winslow