I've connected one of my adapters next to my WAN connection, using FTTP, and the other into the study where it then connects to the modem/router. 

Internet is working perfectly, no issues with the WAN connection dropping or anything, but i can no longer see the 2 devices in the PLC utility software and i'm unable to connect a third device as another pass through. I have the model that has 2x Ethernet ports, so if 1 is being used for the WAN, can the other be used to send LAN network back to the third device? 

I've tried to reinstall the software but nothing is showing.