diff --git a/miniupnpd/Changelog.txt b/miniupnpd/Changelog.txt
index 79b519d..6ae0ca9 100644
--- a/miniupnpd/Changelog.txt
+++ b/miniupnpd/Changelog.txt
@@ -4,6 +4,7 @@ $Id: Changelog.txt,v 1.309 2012/09/27 16:01:10 nanard Exp $
   Fixes with DISABLE_CONFIG_FILE
   and UPNP_STRICT
   UPC must be a 12 decimal digit code
+  SetDefaultConnectionService() checks its argumnents in UPNP_STRICT mode
 
 2012/09/20:
   Cleaning code in ipfw (Jardel Weyrich)
diff --git a/miniupnpd/upnpsoap.c b/miniupnpd/upnpsoap.c
index d0116b8..1457d26 100644
--- a/miniupnpd/upnpsoap.c
+++ b/miniupnpd/upnpsoap.c
@@ -1,4 +1,4 @@
-/* $Id: upnpsoap.c,v 1.110 2012/05/24 16:51:09 nanard Exp $ */
+/* $Id: upnpsoap.c,v 1.111 2012/09/27 11:54:57 nanard Exp $ */
 /* MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
  * (c) 2006-2012 Thomas Bernard
@@ -987,9 +987,14 @@ SetDefaultConnectionService(struct upnphttp * h, const char * action)
 	p = GetValueFromNameValueList(&data, "NewDefaultConnectionService");
 	if(p) {
 		syslog(LOG_INFO, "%s(%s) : Ignored", action, p);
+		BuildSendAndCloseSoapResp(h, resp, sizeof(resp)-1);
+#ifdef UPNP_STRICT
+	} else {
+		/* missing argument */
+		SoapError(h, 402, "Invalid Args");
+#endif
 	}
 	ClearNameValueList(&data);
-	BuildSendAndCloseSoapResp(h, resp, sizeof(resp)-1);
 }
 
 static void