No longer fallback to ANY interface if the user-selected interface cannot be found (closes #143)

src/preferences/advancedsettings.h

@@ -198,14 +198,22 @@ private slots:
     // Network interface
     combo_iface.addItem(tr("Any interface", "i.e. Any network interface"));
     const QString current_iface = pref.getNetworkInterface();
+    bool interface_exists = current_iface.isEmpty();
     int i = 1;
     foreach (const QNetworkInterface& iface, QNetworkInterface::allInterfaces()) {
       if (iface.flags() & QNetworkInterface::IsLoopBack) continue;
       combo_iface.addItem(iface.name());
-      if (!current_iface.isEmpty() && iface.name() == current_iface)
+      if (!current_iface.isEmpty() && iface.name() == current_iface) {
         combo_iface.setCurrentIndex(i);
+        interface_exists = true;
+      }
       ++i;
     }
+    // Saved interface does not exist, show it anyway
+    if (!interface_exists) {
+      combo_iface.addItem(current_iface);
+      combo_iface.setCurrentIndex(i);
+    }
     setRow(NETWORK_IFACE, tr("Network Interface (requires restart)"), &combo_iface);
     // Network address
     txt_network_address.setText(pref.getNetworkAddress());

src/qtlibtorrent/qbtsession.cpp

@@ -1917,12 +1917,6 @@ void QBtSession::setListeningPort(int port) {
   if (!network_iface.isValid()) {
     qDebug("Invalid network interface: %s", qPrintable(iface_name));
     addConsoleMessage(tr("The network interface defined is invalid: %1").arg(iface_name), "red");
-    addConsoleMessage(tr("Trying any other network interface available instead."));
-#if LIBTORRENT_VERSION_MINOR > 15
-    s->listen_on(ports, ec);
-#else
-    s->listen_on(ports);
-#endif
     return;
   }
   QString ip;