You don't have to use RDP, simply by turning off custom error in Web.Config will do. But make sure you are adding that in the root Web.Config, that will do the trick.
Here is an example of mine:
<system.web>
<customErrors mode="Off" />
<compilation debug="true" targetFramework="4.5">
........
</compilation>
</system.web>
Just be aware that there are multiple web.configs in a typical project.. make sure you are adding this in the root web.config
(where your Global.asax
is) and NOT in Views
folder.