You Are Unable to View URLs with a + Sign in them.
If your site is hosted on a Windows 2008 server and you go to a URL that contains a plus sign in the address, you may get an error trying to view the site.
This is a security feature by design in Windows 2008.
To resolve this issue you add this block of code to your system.webServer section of your web.config file. If you need help getting to your web.config file refer to How to access your web.config file.
In the System.WebServer section of your web.config, add the following.
Article ID: 183, Created: April 6, 2012 at 10:08 AM, Modified: August 25, 2014 at 2:43 PM