Unity 2018.2-UNet对接会仅适用于LAN

我正在尝试基于Brackeys的教程来实现UNET Matchmaking系统。

我已经在我的Unity帐户中启用了多人游戏服务并启用了该服务。

当我尝试创建一个匹配项并从局域网中的另一台PC上找到它时，它可以完美工作。

当我尝试创建匹配并从LAN之外的另一台PC上找到它时，在匹配列表中看不到该匹配。

我已经搜索了文档和Google，但未找到任何相关信息。

有人知道吗？

顺便说一下，这是我的JoinRoom脚本。

从回调函数返回成功，但房间列表返回为空。

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Networking;
using UnityEngine.Networking.Match;
using System;

public class JoinGame : MonoBehaviour
{
    List<GameObject> roomList = new List<GameObject>();

    [SerializeField] GameObject roomListItemPrefab;
    [SerializeField] Transform roomListParent;
    [SerializeField] Text status;
    private NetworkManager networkManager;

    void Start()
    {
        networkManager = NetworkManager.singleton;

        if (networkManager.matchMaker == null)
        {
            networkManager.StartMatchMaker();
        }

        RefreshRoomList();

    }

    public void RefreshRoomList()
    {
        ClearRoomList();
        networkManager.matchMaker.ListMatches(0, 20, "", false, 0, 0, OnMatchList);
        status.text = "Loading...";
    }

    public void OnMatchList(bool success, string extendedInfo, List<MatchInfoSnapshot> responseData)
    {
        status.text = "";

        if (!success)
        {
            status.text = "Couldn't get room list";
            return;
        }

        responseData.ForEach(match =>
        {
            GameObject _roomListItemGO = Instantiate(roomListItemPrefab);
            _roomListItemGO.transform.SetParent(roomListParent);
            RoomListItem _roomListItem = _roomListItemGO.GetComponent<RoomListItem>();

            if (_roomListItem != null)
            {
                _roomListItem.Setup(match, JoinRoom);
            }

            //as well as setting up a callback function that will join the game
            roomList.Add(_roomListItemGO);
        });

        if (roomList.Count == 0)
        {
            status.text = "No rooms at the moment";
        }
    }

    public void JoinRoom(MatchInfoSnapshot _match)
    {
        Debug.Log($"Joining {_match.name}");
        networkManager.matchMaker.JoinMatch(_match.networkId, "", "", "", 0, 0, networkManager.OnMatchJoined);
        ClearRoomList();
        status.text = $"Joining {_match.name}...";
    }

    private void ClearRoomList()
    {
        roomList.ForEach(item =>
        {
            Destroy(item);
        });

        roomList.Clear();
    }
}