rabbit 在.net 环境下偶现（大概率）:None of the specified endpoints were reachable 异常

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public static string SendMessage(string jsonStr, string className, string actionName, string authCode, int timeout = 10000)
        {

            if (cf.HostName == null || string.IsNullOrWhiteSpace(cf.HostName) || cf.HostName == "localhost")
            {
                cf.HostName = hostName;
                cf.VirtualHost = virtualHost;
                cf.UserName = userName;
                cf.Password = password;
            }
using (IConnection conn = cf.CreateConnection())
            {
                using (IModel ch = conn.CreateModel())
                {

                    var requst = new RMQRequest
                    {
                        ClassName = className,
                        ActionName = actionName,
                        JStr = jsonStr,
                        Timestamp = DateTime.Now
                    };
 object[] reqobj = new object[1];

                    reqobj[0] = JsonConvert.SerializeObject(requst);

                    SimpleRpcClient client = new SimpleRpcClient(ch, authCode);
                    client.TimeoutMilliseconds = timeout;
                    client.TimedOut += new EventHandler(TimedOutHandler);
                    client.Disconnected += new EventHandler(DisconnectedHandler);
                    var reply = client.Call(reqobj);
 if (reply == null)
                    {
                        return null;
                    }
                    else
                    {
                        return reply[0].ToString();
                    }

                }
            }
        }