Question

I’m not really sure what is wrong because I have tried the other method overload for TcpListener.Start(int backlog) but the same result occurred. Maybe it is something wrong with how I initialized it?

Answer 1

Why are you specifying a host and port twice? Supplying them to the TcpListener constructor should suffice:

public Station()
{
    this.connections = new List<TcpClient>();
    this.server = new TcpCient(IPAddress.Loopback, 6969);
}

public void Start()
{
    server.Start();
}