Crash using Sockets

Hi guys, just trying to use sockets in my app and unity crashes when declaring a new socket: Just this line crashes unity entirely, even when put on a coroutine

 Socket soc = listener.AcceptSocket(); 

What I'm missing?

Here is full server code:

 using UnityEngine;
 using System;
 using System.Collections;
 using System.IO;
 using System.Net;
 using System.Net.Sockets;
 
 
 public class ReceiveStuff : MonoBehaviour {
     
     TcpListener listener;
     
     // Use this for initialization
     void Start () 
     {
         listener = new TcpListener(2333);
         listener.Start();
         Debug.Log("Server Iniciado");
         StartCoroutine("listen");
     }
     
     
     IEnumerator listen()
     {
         while(true)
         {    
         Socket soc = listener.AcceptSocket();
         Debug.Log("Conectados" + soc.RemoteEndPoint.ToString());
         
         try
         {
             Stream s = new NetworkStream(soc);
             StreamReader sr = new StreamReader(s);
             StreamWriter sw = new StreamWriter(s);
             sw.AutoFlush = true;
             while(true)
             {
                 string name = sr.ReadLine();
                 if(name == "" || name == null) 
                 { 
                 
                 }
                 else
                 {
                     Debug.Log("RECEBIDO: " + name);
                 }
             }
             s.Close();
         }
         catch(Exception e)
         {
             Debug.Log("EXCEPTION: " + e.Message);
         }
         
         soc.Close();
 
         yield return null;
             
         }
         
     }