SharePoint 2010/2013 : The "New Web Application" button is disabled is the central administration

Problem

In the SharePoint central administration (2010 ou 2013 version), the "New Web Application" button is disabled is the central administration.

Resolution

The resolution of this problem is simple : in your browser, add the central administration URL in the « Intranet Local » zone.

1. In the browser, click on "Tools", then on "Internet Options" (Here on IE 10)

2. Clck on the "Security" tab, select « Local Intranet » then click on « Sites »

3. Verify that the "Automatically detect[...]" option is selected, then click on "Advanced".

4. Click on "Add" to add the URL. Click on "Close".

5.  Validate all window and relaunch IE : the functionality is now available.