no need to close and re-open the listen socket when starting the DHT. Report the actual port we ended up listening on if the system chose one. don't try to listen on i2p

examples/client_test.cpp

@@ -1152,7 +1152,7 @@ int main(int argc, char* argv[])
 
 	ses.set_proxy(ps);
 
-	ses.listen_on(std::make_pair(listen_port, listen_port + 10)
+	ses.listen_on(std::make_pair(listen_port, listen_port)
 		, ec, bind_to_interface.c_str());
 	if (ec)
 	{

src/i2p_stream.cpp

@@ -91,6 +91,8 @@ namespace libtorrent
 		m_sam_router = s;
 		m_sam_router.type = proxy_settings::i2p_proxy;
 
+		if (m_sam_router.hostname.empty()) return;
+
 		m_state = sam_connecting;
 
 		char tmp[20];

src/session_impl.cpp

@@ -1779,6 +1779,11 @@ namespace aux {
 			return listen_socket_t();
 		}
 
+		// if we asked the system to listen on port 0, which
+		// socket did it end up choosing?
+		if (ep.port() == 0)
+			ep.port(s.sock->local_endpoint().port());
+
 		if (m_alerts.should_post<listen_succeeded_alert>())
 			m_alerts.post_alert(listen_succeeded_alert(ep));
 
@@ -4365,12 +4370,6 @@ namespace aux {
 	{
 		INVARIANT_CHECK;
 
-		if (m_listen_interface.port() != 0)
-		{
-			error_code ec;
-			open_listen_port(0, ec);
-		}
-
 		if (m_dht)
 		{
 			m_dht->stop();