我正在处理简单的客户端服务器应用程序,它就像聊天Messenger一样。 我正在使用Client Server方法。我的应用程序在LAN局域网上工作正常。但是当它尝试通信以切断局域网外。然后没有对客户的回复。虽然我知道服务器IP地址(通过外部手段)使用宽带连接并驻留在WAN上。 我想我无法解析IP地址,或代理问题发生。 有人可以帮帮我吗? 问候 ! Sm.Abdullah
//
/* Server Program */
using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
public class serv {
public static void Main() {
try {
IPAddress ipAd = IPAddress.Parse("172.21.5.99");
// use local m/c IP address, and
// use the same in the client
/* Initializes the Listener */
TcpListener myList=new TcpListener(ipAd,8001);
/* Start Listeneting at the specified port */
myList.Start();
Console.WriteLine("The server is running at port 8001...");
Console.WriteLine("The local End point is :" +
myList.LocalEndpoint );
Console.WriteLine("Waiting for a connection.....");
Socket s=myList.AcceptSocket();
Console.WriteLine("Connection accepted from " + s.RemoteEndPoint);
byte[] b=new byte[100];
int k=s.Receive(b);
Console.WriteLine("Recieved...");
for (int i=0;i<k;i++)
Console.Write(Convert.ToChar(b[i]));
ASCIIEncoding asen=new ASCIIEncoding();
s.Send(asen.GetBytes("The string was recieved by the server."));
Console.WriteLine("\nSent Acknowledgement");
/* clean up */
s.Close();
myList.Stop();
}
catch (Exception e) {
Console.WriteLine("Error..... " + e.StackTrace);
}
}
}
---------------------------------------------------------------------------
/* Client Program */
using System;
using System.IO;
using System.Net;
using System.Text;
using System.Net.Sockets;
public class clnt {
public static void Main() {
try {
TcpClient tcpclnt = new TcpClient();
Console.WriteLine("Connecting.....");
// here is local ip..
// if i replace it with WAN IP it does not communicate.
tcpclnt.Connect("172.21.5.99",8001);
// use the ipaddress as in the server program
Console.WriteLine("Connected");
Console.Write("Enter the string to be transmitted : ");
String str=Console.ReadLine();
Stream stm = tcpclnt.GetStream();
ASCIIEncoding asen= new ASCIIEncoding();
byte[] ba=asen.GetBytes(str);
Console.WriteLine("Transmitting.....");
stm.Write(ba,0,ba.Length);
byte[] bb=new byte[100];
int k=stm.Read(bb,0,100);
for (int i=0;i<k;i++)
Console.Write(Convert.ToChar(bb[i]));
tcpclnt.Close();
}
catch (Exception e) {
Console.WriteLine("Error..... " + e.StackTrace);
}
}
}
答案 0 :(得分:0)
您检查过防火墙/路由器吗?
大部分时间未经请求的传入连接都被驳回,并且会失败,因为它们可能在起源和性质上都是恶意的。
然而,您可以通过查看NAT遍历来解决其中一些问题
请参阅:tcp client to communicate with server present in different network (NAT issue)