Based on http://liferea.git.sourceforge.net/git/gitweb.cgi?p=liferea/liferea;a=commitdiff;h=fc49ae0c9c1add55754ff5731c586b22096fbb06

diff -up liferea-1.6.5/src/update.c.nm09 liferea-1.6.5/src/update.c
--- liferea-1.6.5/src/update.c.nm09	2011-03-27 10:40:26.045331006 -0700
+++ liferea-1.6.5/src/update.c	2011-03-27 11:06:53.819481098 -0700
@@ -589,6 +589,17 @@ update_process_finished_job (updateJobPt
 }
 
 #ifdef USE_NM
+static gboolean
+is_nm_connected (guint state)
+{
+	if (state == 3 ||  /* NM_STATE_CONNECTED */
+           state == 50 || /* NM_STATE_CONNECTED_LOCAL */
+           state == 60 || /* NM_STATE_CONNECTED_SITE */
+           state == 70)   /* NM_STATE_CONNECTED_GLOBAL */
+               return TRUE;
+	return FALSE;
+}
+
 static void
 update_network_monitor (libnm_glib_ctx *ctx, gpointer user_data)
 {
@@ -600,10 +611,10 @@ update_network_monitor (libnm_glib_ctx *
 	state = libnm_glib_get_network_state (ctx);
 	online = network_is_online ();
 
-	if (online && state == LIBNM_NO_NETWORK_CONNECTION) {
+	if (online && !is_nm_connected (state)) {
 		debug0 (DEBUG_UPDATE, "network manager: no network connection -> going offline");
 		network_set_online (FALSE);
-	} else if (!online && state == LIBNM_ACTIVE_NETWORK_CONNECTION) {
+	} else if (!online && is_nm_connected (state)) {
 		debug0 (DEBUG_UPDATE, "network manager: active connection -> going online");
 		network_set_online (TRUE);
 	}