On a recent Citrix Access Gateway implementation, I found these links to be very useful and thought I’d pass them on:

Access Gateway Administrators Guide

http://support.citrix.com/article/CTX117022

Citrix Access Gateway Port Configuration

http://support.citrix.com/article/CTX113250

Convert PFX Certificate to PEM Format for Use with Citrix Access Gateway

http://support.citrix.com/article/CTX106028

How to Forward Credentials from Access Gateway to the Web Interface

http://support.citrix.com/article/CTX106202