This video will describe the steps needed to configure single-sign on authentication on the IronPort Web Security Appliance. It also describes the changes needed on the client browsers so that the client will trust the IronPort device.
0:05 IronPort Configuration
1:00 Internet Explorer Configuration
1:40 FireFox Configuration
These details are also available in these knowledge base articles.
http://tinyurl.com/2n2ykh
http://tinyurl.com/3b2mu7