C# code run in App Console but not on Unity console

Hi guys! First, sorry for my english. Now, I have a problem with a code which uses sockets. I want connect my script over IPv6 but I receive a SocketException when I run this script in Unity. The next code works perfect as a Console Application Project in MonoDevelop.

             Socket s;
             s = new Socket(AddressFamily.InterNetworkV6, SocketType.Dgram, ProtocolType.Udp);
             IPAddress ip = IPAddress.Parse("ff15::2");
             s.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.AddMembership, new IPv6MulticastOption(ip));
             IPEndPoint ipep = new IPEndPoint(IPAddress.IPv6Any, 26000);
             s.Bind(ipep);
             
             while (true) {
                 byte[] b = new byte[1024];
                 if (s == null)
                     Console.WriteLine ("S es null");
                 else
                     s.Receive (b);
                 string str = System.Text.Encoding.ASCII.GetString (b, 0, b.Length);
                 Console.WriteLine (str.Trim ());
             }
         }

But the same code (I only changed "Console.WriteLine()" for "Debug.Log()") doesn't work as Unity Project. This code break with the exception: "SocketException: An address incompatible with the requested protocol was used." Can someone help me? Thanks!

Santiago.