this is the code which runs server in a thread infinitely and client for three times, this code works fine when i connect two laps in my mobile hot spot but then when i try to connect to my college WiFi(larger network)it is not working so what should i do to get it right when i connect to college network

thanks in advance :)

import java.io.*;  
import java.net.*;   
import java.util.*;  
public class MyServer 
{  
public static void main(String[] args)
{  
    new thser();
    for (int i=0;i<3;i++ )
    {
            try
        {      
            Scanner in=new Scanner(System.in);
            String mys=in.nextLine();
            Socket s=new Socket("112.168.43.134",6666);  
            DataOutputStream dout=new DataOutputStream(s.getOutputStream());  
            dout.writeUTF(mys);  
            dout.flush();  
            dout.close();  
            s.close();  

        }
            catch(Exception e)
        {
            System.out.println(e);
        }   

    }

}  
}  

 class thser extends Thread
{

    public thser()
    {
        start();
    }

   public void run()
   {
    while(true)
    {
        try

        {  
            ServerSocket ss=new ServerSocket(6666);  
            Socket s=ss.accept();//establishes connection   
            DataInputStream dis=new DataInputStream(s.getInputStream());  
            String  str=(String)dis.readUTF();  
            System.out.println("message= "+str);  
            ss.close(); 
        }
        catch(Exception e)
        {
        System.out.println(e);
        }
    }
}

}