I am using Dual Kinect V2s, I have the firewall on both PCs disabled, all antivirus software disabled and the application ran as administrator just in case. I have my PC and the Laptop both connected via Ethernet. When I set either as a slave and attempt to connect to slave the list shows nothing. I can ping both machines from each machine. Using iPi Recorder 4.4.5.82.

Do I need iPi Mocap Studio trial installed first? I'm trying to make sure the recording phase is working before activating the trial.

Probably something blocking the traffic still sits there unnoticed.
Try connecting PCs via WiFi hotspot instead.