diff -r 5223bc59b467 src/internet/model/tcp-socket-base.cc
--- a/src/internet/model/tcp-socket-base.cc	Wed Jan 27 16:33:16 2016 +0000
+++ b/src/internet/model/tcp-socket-base.cc	Sun Jan 31 01:59:05 2016 +0000
@@ -1723,8 +1726,8 @@
       // Always respond to first data packet to speed up the connection.
       // Remove to get the behaviour of old NS-3 code.
       m_delAckCount = m_delAckMaxCount;
+      NotifyNewConnectionCreated (this, fromAddress);
       ReceivedAck (packet, tcpHeader);
-      NotifyNewConnectionCreated (this, fromAddress);
       // As this connection is established, the socket is available to send data now
       if (GetTxAvailable () > 0)
         {
@@ -1754,6 +1757,7 @@
               m_endPoint6->SetPeer (Inet6SocketAddress::ConvertFrom (fromAddress).GetIpv6 (),
                                     Inet6SocketAddress::ConvertFrom (fromAddress).GetPort ());
             }
+          NotifyNewConnectionCreated (this, fromAddress);
           PeerClose (packet, tcpHeader);
         }
     }