Socket connection error. SOS!

Hi,I'm trying to create a connection between unity and my server, but unity gives me SocketExeption: No connection could be made because the target machine actively refused it.
When I Use this code just in the C # it works great, but Unity does not want to be connected...
Here is my code:

SERVER:

Code (csharp):

1.  
2. using System;
3. using System.Collections.Generic;
4. using System.Linq;
5. using System.Text;
6. using System.Threading.Tasks;
7.  
8. using System.Net;
9. using System.Net.Sockets;
10.  
11. namespace Server001
12. {
13.     class Program
14.     {
15.         static void Main(string[] args)
16.         {
17.             //Set sockets
18.             IPHostEntry ipHost = Dns.GetHostEntry("localhost");
19.             IPAddress ipAddr = ipHost.AddressList[0];
20.             IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 8081);
21.  
22.             // Create socket Tcp/Ip
23.             Socket sListener = new Socket(ipAddr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
24.  
25.             try
26.             {
27.                 sListener.Bind(ipEndPoint);
28.                 sListener.Listen(10);
29.  
30.                 //StartListening
31.                 while (true)
32.                 {
33.                     Console.WriteLine("Waiting for connection on port {0}", ipEndPoint);
34.  
35.                     // Wait
36.                     Socket handler = sListener.Accept();
37.                     string data = null;
38.  
39.                     // Talk to client
40.                    
41.                     byte[] bytes = new byte[1024];
42.                     int bytesRec = handler.Receive(bytes);
43.                    
44.                     data += Encoding.UTF8.GetString(bytes, 0, bytesRec);
45.                    
46.                     Console.Write("Receive from Client" + data + "\n\n");
47.                    
48.                     string reply = "Length of your request is" + data.Length.ToString()
49.                             + " symbols";
50.                     byte[] msg = Encoding.UTF8.GetBytes(reply);
51.                     handler.Send(msg);
52.  
53.                     if (data.IndexOf("<TheEnd>") > -1)
54.                     {
55.                         Console.WriteLine("The End");
56.                         break;
57.                     }
58.                    
59.                     handler.Shutdown(SocketShutdown.Both);
60.                     handler.Close();
61.                 }
62.             }
63.             catch (Exception ex)
64.             {
65.                 Console.WriteLine(ex.ToString());
66.             }
67.             finally
68.             {
69.                 Console.ReadLine();
70.             }
71.         }
72.     }
73. }
74.  
75.  

CLIENT:

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. using System.Net;
6. using System;
7. using System.Net.Sockets;
8. using System.Text;
9.  
10. public class SEnder : MonoBehaviour {
11.  
12.     // Use this for initialization
13.     void Start () {
14.                 // buffer
15.                 byte[] bytes = new byte[1024];
16.        
17.                 //
18.        
19.                 //
20.                 IPHostEntry ipHost = Dns.GetHostEntry ("127.0.0.1");
21.                 IPAddress ipAddr = ipHost.AddressList [0];
22.                 IPEndPoint ipEndPoint = new IPEndPoint (ipAddr, 8081);
23.        
24.                 Socket sender = new Socket (ipAddr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
25.        
26.                 //
27.                 sender.Connect (ipEndPoint);
28.        
29.                 string message = "Hi, from Unity3d";
30.        
31.                 byte[] msg = Encoding.UTF8.GetBytes (message);
32.        
33.                 int bytesSent = sender.Send (msg);
34.        
35.                 int bytesRec = sender.Receive (bytes);
36.  
37.                 sender.Shutdown (SocketShutdown.Both);
38.                 sender.Close ();
39.         }
40.     // Update is called once per frame
41.     void Update () {
42.    
43.     }
44. }
45.  
46.  

So we just send to the server line "Hi, from Unity3d"
But got SocketException.
Help me please. I really do not know what to do =((

P.S: I think the problem is not the firewall becaus I've tried to disable it but nothing has changed.