Most of the issues that I've seen working with Netscaler have been related to the communications between the DMZ server and the internal web server, auth server or presentation server on the connection. The DMZ out to the client side is all on https but these internal communications to the back end servers off to the final resource have other ports involved and can be to different servers for different parts of the process.
You description sounds like the issue will be with the presentation server or the resource downstream of that.