Chapter 1 What’s New for FortiOS 5.0 : Authentication: users and devices : Citrix Agent support for Single Sign On : To enable single sign-on using polling mode
  
To enable single sign-on using polling mode
1. Go to User & Device > Authentication > Single Sign-On and select Create New to add a single sign-on server.
2. Select Fortinet Single-Sign-On Agent.
3. Enter the Name and the IP address or Name and password for the Citrix server.
4. Select OK to save the configuration.