Correct Answer:
Explanation/Reference:
Note:
* Reverse proxy server A reverse proxy server that supports Secure Sockets Layer (SSL), such as Microsoft Forefront Unified Access Gateway (UAG), enables you to publish SharePoint sites across the corporate firewall.
* See step 2 below:
After the SharePoint site is published outside the firewall, you must add the site to a zone that allows for cross-firewall access. A cross-firewall access zone is used to generate external PC and mobile URLs in mobile alert messages, and enables users to send an externally available URL when they click the E-mail a link or Alert Me button on the ribbon.
To configure a cross-firewall access zone
1. Verify that you have the following administrative credentials:
You must be a member of the Farm Administrators group.
2. In Central Administration, click System Settings.
3. On the System Settings page, under Farm Management, click Configure cross firewall access zone.
4. On the Cross Firewall Access Zone page, in Web Application, in the Web Application list, select the web application that is published across the firewall.
5. In Cross Firewall Access Zone, in the Zone selection for cross firewall access list, select the zone that is published across the firewall.
Reference: Configure external access for mobile devices in SharePoint 2013
