*** empty log message ***

src/udp_tracker_connection.cpp

@@ -198,6 +198,8 @@ namespace libtorrent
 		detail::write_int32(m_request.num_want, out);
 		// port
 		detail::write_uint16(m_request.listen_port, out);
+		// extensions
+		detail::write_uint16(0, out);
 
 		m_socket->send(&buf[0], buf.size());
 		m_request_time = second_clock::universal_time();