Index: ui-gtk/UgtkSetting.c
--- ui-gtk/UgtkSetting.c.orig
+++ ui-gtk/UgtkSetting.c
@@ -49,9 +49,7 @@
 
 #define UGTK_ARIA2_PATH    "aria2c"
 
-#define UGTK_ARIA2_ARGS    "--enable-rpc=true -D " \
-                           "--disable-ipv6 "       \
-                           "--check-certificate=false"
+#define UGTK_ARIA2_ARGS    "--enable-rpc=true -D "
 
 #define UGTK_ARIA2_URI     "http://localhost:6800/jsonrpc"