JavaScript TcpClient().Connect freezes

I'm making an MMORPG using Unity. I'm using the following system to connect to Java server.

 import System;
 import System.Threading;
 import System.Net;
 import System.Net.Sockets;
 
 private var WorkerThread : Thread;
 private var client : TcpClient;
 private var ns : NetworkStream;
 
 function Start () {
     WorkerThread = new Thread(ThreadListener);
     WorkerThread.Start();
 }
 
 private function ThreadListener(){
     client = new TcpClient();
     var port = 16304;
     
     try{
         print("running..");
         client.Connect(IPEndPoint(IPAddress.Parse("127.0.0.1"), port));
         
         print("Connected..");
         
         ns = client.GetStream();
         
          var data = new byte[1024];
          
          var waitCounter = 0;
          print("connection made");
          
          var read = 0;
          
          while(true){
              do{
                  try{
                      read = ns.Read(data, 0, data.Length);
                      var word = System.Text.Encoding.ASCII.GetString(data, 0, read);
                      Action(word);
                  }
                  catch(err){
                   print(err.Message);
                  }
              } while(ns.CanRead);
          }
     }      
     catch (InvOpEx : InvalidOperationException) {
         Debug.Log("TCP exception: " + InvOpEx.Message);
     }
           
     catch (SockEx : SocketException) {
         Debug.Log("Socket exception: " + SockEx.Message);
     }
     finally {
         if(ns != null)
               ns.Close();
         client.Close();
     }
 }

When I first run the game, it connects to server just fine and everything works as it should. When I then close the program and try to run it again, the whole Unity freezes. I'm sure the problem isn't on the server side (had to make a java coded client to make sure). If I then close the server when Unity is frozen, after a couple of seconds it just gives an error message saying that it couldn't connect to server. Any help is greatly appreciated.