diff --git a/libs/ardour/session_state.cc b/libs/ardour/session_state.cc
index d90346073c..7914b21565 100644
--- a/libs/ardour/session_state.cc
+++ b/libs/ardour/session_state.cc
@@ -308,6 +308,8 @@ Session::post_engine_init ()
 
 	_state_of_the_state = Clean;
 
+	Port::set_connecting_blocked (false);
+
 	DirtyChanged (); /* EMIT SIGNAL */
 
 	if (_is_new) {