Remoting通信，本机测试通过，局域网内不同机器通信失败？求解

Remoting通信，本机测试通过，局域网内不同机器通信失败。
错误：由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。
//服务器监听
int port = 80;
                int.TryParse(EditionControlAppMode.Tool.GetConfig("UserServerPort"), out port);                TcpServerChannel server = new TcpServerChannel(Guid.NewGuid().ToString(), port);
                string virtpath = EditionControlAppMode.Tool.GetConfig("UserServerVirtPath");
                if (string.IsNullOrEmpty(virtpath))
                    virtpath = "aspnet_client";
                ChannelServices.RegisterChannel(server, false);
                RemotingConfiguration.RegisterWellKnownServiceType(typeof(EditionControlAppMode.MessageInfo), virtpath, WellKnownObjectMode.SingleCall);
                EditionControlAppMode.MessageInfo.SendEventArgs += new EditionControlAppMode.SendEventHandler(MessageInfo_SendEventArgs);客户端/// <summary>
        /// 连接客户端
        /// </summary>
        /// <param name="MsgObj">客户端对象</param>
        /// <param name="Ip">客户端IP</param>
        /// <param name="Port">客户端端口</param>
        /// <param name="VirtPath">虚拟路径</param>
        /// <returns></returns>
        public bool TelnetClient(ref EditionControlAppMode.MessageInfo MsgObj, string Ip, string Port, string VirtPath)
        {
            try
            {
                if (string.IsNullOrEmpty(Ip) || string.IsNullOrEmpty(VirtPath))
                    return false;
                string port = Port;
                if (string.IsNullOrEmpty(port))
                    port = "80";
                string url = "tcp://" + Ip + ":" + port + "/" + VirtPath;
                BinaryClientFormatterSinkProvider tBinaryProvider = new BinaryClientFormatterSinkProvider();                TcpClientChannel server = new TcpClientChannel(Guid.NewGuid().ToString(), tBinaryProvider);
                ChannelServices.RegisterChannel(server, false);
                MsgObj = (EditionControlAppMode.MessageInfo)Activator.GetObject(typeof(EditionControlAppMode.MessageInfo), url);
                if (MsgObj != null)
                {
                    return true;
                }
                return false;
            }
            catch
            {
                return false;
            }
        }
IP还有端口什么的都设置的没问题，本地测试可以局域网内不行！！！