More descriptive error message if server ip/port is can't be resolved, updateinfobox automatic scroll

Subsurface/Source/Screens/ServerListScreen.cs

@@ -78,7 +78,8 @@ namespace Subsurface
 
             GUIButton button = new GUIButton(new Rectangle(-20, -20, 100, 30), "Back", Alignment.TopLeft, GUI.Style, menu);
             button.OnClicked = GameMain.MainMenuScreen.SelectTab;
-            
+            button.CanBeSelected = false;
+            button.SelectedColor = button.Color;
 
             refreshDisableTimer = DateTime.Now;
         }