qbt: disable port forwarding

services/qbittorrent.nix

@@ -198,6 +198,12 @@
         PieceExtentAffinity = true;
         SuggestMode = true;
       };
+
+      Network = {
+        # traffic is routed through a vpn, we don't need
+        # port forwarding
+        PortForwardingEnabled = false;
+      };
     };
   };