这个异常在创建连接时抛出（CreateConnection()），原因一般是ConnectionFactory参数设置不对，比如HostName、UserName、Password
var factory = new ConnectionFactory();
factory.UserName = QueueSetttiong.UserName; //用户名
factory.Password = QueueSetttiong.Password; //密码
factory.HostName = QueueSetttiong.HostName; //Rabbitmq服务IP，不包含端口
factory.Port = AmqpTcpEndpoint.UseDefaultPort;
factory.VirtualHost = QueueSetttiong.VirtualHost; //默认为"/"
factory.Protocol = Protocols.DefaultProtocol;
