C# TcpListener与MySqlConnection运行一段时间后停止接受连接

我使用C#编写了一个异步Socket服务器，部署在运行Amazon Linux的Lightsail服务器上。该服务器通过TcpListener接受连接，当有客户端连接时启动新线程监听，完成SSL连接初始化后作为在线游戏服务器运行。

服务器正常运行约一天后，会突然出现网络完全失效的情况，故障出现间隔从22小时到一周不等，具体症状如下：

• 已连接的客户端会突然停止收发数据，日志显示无活动检测代码最终因未收到心跳包将其踢下线。
• 服务器无法连接本地运行的MySQL数据库（此时仍可通过PHPMyAdmin访问该数据库）。
• 服务器仍可向文件和控制台写入内容，日志功能正常。

我的代码与常规实现类似，已尝试参考Stack Overflow相关问题的优化方案，但服务器仍在约24小时后出现故障。故障发生前无任何异常日志，导致排查困难。

主循环代码 #

public void ListenLoop()
{
    TcpListener listener = new TcpListener(IPAddress.Any, 26000);
    listener.Start();

    while (true)
    {
        try
        {
            if (listener.Pending())
            {
                listener.BeginAcceptTcpClient(new AsyncCallback(AcceptConnection), listener);
                Logger.Write(Logger.Level.INFO, "continuing the main loop");
            }
            // Yield so we're not stuck in a busy-loop
            Thread.Sleep(5);
        }
        catch (Exception e)
        {
            Logger.Write(Logger.Level.ERROR, $"Error while waiting for listeners: {e.Message}\n{e.StackTrace}");
        }
    }
}

连接接受相关代码 #

/// <summary>
/// Finish an async callback but spawn a new thread to handle it if necessary
/// </summary>
/// <param name="ar"></param>
private void AcceptConnection(IAsyncResult ar)
{
    if (ar.CompletedSynchronously)
    {
        // Force the accept logic to run async, to keep our listening
        // thread free.
        Action accept = () => AcceptCallback(ar);
        accept.BeginInvoke(accept.EndInvoke, null);
    } else
    {
        AcceptCallback(ar);
    }
}

private void AcceptCallback(IAsyncResult ar)
{
    try
    {
        TcpListener listener = (TcpListener) ar.AsyncState;
        TcpClient client = listener.EndAcceptTcpClient(ar);
        // If the SSL connection takes longer than 5s we have a problem, and should stop
        client.Client.ReceiveTimeout = 5000;

        // Attempt to get the IP address of the client we're connecting to
        IPEndPoint ipep = (IPEndPoint)client.Client.RemoteEndPoint;
        string ip = ipep.Address.ToString();
        Logger.Write(Logger.Level.INFO, $"Connection begun to {ip}");

        // Authenticate and begin communicating with the client
        SslStream stream = new SslStream(client.GetStream(), false);
        try
        {
            stream.AuthenticateAsServer(
                serverCertificate,
                enabledSslProtocols: System.Security.Authentication.SslProtocols.Tls12,
                clientCertificateRequired: false,
                checkCertificateRevocation: true
                );

            stream.ReadTimeout = 3600000;
            stream.WriteTimeout = 3600000;

            NetworkPlayer player = new NetworkPlayer();
            player.Name = ip;
            player.Connection.Stream = stream;
            player.Connection.Connected = true;
            player.Connection.Client = client;
            stream.BeginRead(player.Connection.Buffer, 0, 1024, new AsyncCallback(ReadCallback), player);
        }
        catch (Exception e)
        {
            Logger.Write(Logger.Level.ERROR, $"Error while starting the connection to {ip}: {e.Message}");
            // The following code just calls stream.Close(); and client.Close(); but sends exceptions to my logger.
            CloseConnectionSafely(client, stream);
        }
    }
    catch (Exception e)
    {
        Logger.Write(Logger.Level.ERROR, $"Error while starting a connection to an unknown user: {e.Message}");
    }
}

内容的提问来源于stack exchange，提问作者OrdiNeu