diff --git a/source/ubl-settings-datetime.c b/source/ubl-settings-datetime.c
index edc9b8f..3648b31 100644
--- a/source/ubl-settings-datetime.c
+++ b/source/ubl-settings-datetime.c
@@ -83,22 +83,39 @@ void yon_save_parameters(GtkWidget *self, main_window *widgets){
 
 }
 
-void on_config_save(GtkWidget *){
+int check_input(main_window *widgets){
+    int ntp_active = gtk_combo_box_get_active(GTK_COMBO_BOX(widgets->DHCPCombo));
+    if (ntp_active == 4){
+        const char *ntp = gtk_entry_get_text(GTK_ENTRY(widgets->NTPEntry));
+        if (yon_char_is_empty(ntp)){
+            yon_ubl_status_box_render(EMPTY_IMPORTANT_LABEL,BACKGROUND_IMAGE_FAIL_TYPE);
+            yon_ubl_status_highlight_incorrect(widgets->NTPEntry);
+            return 0;
+        }
+    }
+    return 1;
+}
+
+void on_config_save(GtkWidget *,main_window *widgets){
+    if (!check_input(widgets)) return;
     main_config.save_config=2;
     yon_save_proceed(NULL,YON_CONFIG_BOTH,config_get_global_command,NULL);
 }
 
-void on_config_save_global(GtkWidget *){
+void on_config_save_global(GtkWidget *,main_window *widgets){
+    if (!check_input(widgets)) return;
     main_config.save_config=0;
     yon_save_proceed(NULL,YON_CONFIG_GLOBAL,config_get_global_command,NULL);
 }
 
-void on_config_save_local(GtkWidget *){
+void on_config_save_local(GtkWidget *,main_window *widgets){
+    if (!check_input(widgets)) return;
     main_config.save_config=1;
     yon_save_proceed(NULL,YON_CONFIG_LOCAL,config_get_local_command,NULL);
 }
 
-void on_config_save_custom(GtkWidget *){
+void on_config_save_custom(GtkWidget *,main_window *widgets){
+    if (!check_input(widgets)) return;
     main_config.save_config=3;
     yon_save_proceed(NULL,YON_CONFIG_CUSTOM,config_get_global_command,NULL);
 }
diff --git a/source/ubl-settings-datetime.h b/source/ubl-settings-datetime.h
index 7a5fb19..527c5c9 100644
--- a/source/ubl-settings-datetime.h
+++ b/source/ubl-settings-datetime.h
@@ -124,13 +124,15 @@ void on_ntp_sync(GtkWidget *, main_window *widgets);
 
 void yon_save_parameters(GtkWidget *self,main_window *widgets);
 
-void on_config_save(GtkWidget *);
+int check_input(main_window *widgets);
 
-void on_config_save_global(GtkWidget *);
+void on_config_save(GtkWidget *,main_window *widgets);
 
-void on_config_save_local(GtkWidget *);
+void on_config_save_global(GtkWidget *,main_window *widgets);
 
-void on_config_save_custom(GtkWidget *);
+void on_config_save_local(GtkWidget *,main_window *widgets);
+
+void on_config_save_custom(GtkWidget *,main_window *widgets);
 
 void on_config_load_global();
 
diff --git a/ubl-settings-datetime.css b/ubl-settings-datetime.css
index f60dc43..c148da2 100644
--- a/ubl-settings-datetime.css
+++ b/ubl-settings-datetime.css
@@ -5,6 +5,18 @@
 .boxInfoMessOK{
     background-color: #f3f0ac;
 }
+.errorBox {
+	border-width: 2px;
+	border-color: #ea9999;
+	border-style:solid;
+}
+
+.chosenOutline{
+	transition: 0ms;
+	border-width: 1px;
+	border-color: #f3f0ac;
+	border-style:solid;
+}
 .textHead{
     text-shadow: 2px 2px @theme_bg_color;
     color: @theme_text_color;