I couldn’t find the answer to get my TCP listener to work in the engine.
It would work in the C# server, but not the UE4 server.
The project required me to send some data to a server that acts as a high scores board. For this, it would be quite silly to have the client connect, so instead I made the “server” a UDP listener that listens for UDP packets.
This enabled my UE4 client to send information to the UE4 UDP Server.
Props to Ramas UDP tutorial.