Unity - How to Create a Basic Server / Client With LiteNetLib

Client.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using LiteNetLib;

public class Client : MonoBehaviour {
    NetManager netManager;
    EventBasedNetListener netListener;

    // Start is called before the first frame update
    void Start() {
        netListener = new EventBasedNetListener();
        netListener.PeerConnectedEvent += (server) => {
            Debug.LogError($"Connected to server: {server}");
        };

        netManager = new NetManager(netListener);
        netManager.Start(); // Don't forget to call .Start()!
        netManager.Connect("localhost", 9050);
    }

    // Update is called once per frame
    void Update() {
        netManager.PollEvents();
    }
}

Server.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using LiteNetLib;

public class Server : MonoBehaviour {
    NetManager netManager;
    NetListener netListener;

    // Start is called before the first frame update
    void Start() {
        netListener = new EventBasedNetListener();

        netListener.ConnectionRequestEvent += (request) => {
            request.Accept();
        };

        netListener.PeerConnectedEvent += (client) => {
            Debug.LogError($"Client connected: {client}");
        };

        netManager = new NetManager(netListener);
    }

    // Update is called once per frame
    void Update() {
        netManager.PollEvents();
    }
}

need to add next line:

// Server Start
netManager.Start(9050);