i have discussed it with a guy i know at a cadence but i've not logged it officially yet.
The version of cadence is: IC5141_USR6
The setup for using NX is:
1) NX is fired up from an ubuntu 8.04 laptop
2) The machine on which the NX is running is gentoo linux
3) From that gentoo linux machine i ssh onto a 2nd machine which is redhat linux 4.0
4) From that redhat machine i run cadence