When clicking a link to install and iPrint printer, I get a pause followed
by a remote procedure call failure

from ipperrs.txt

Module: iprntcmd.exe
Trace info: ippmain.c line 1132, thread 0000e358
Routine: IppPrintInstaller - AddPrinterConnection failed 1726
Error: The remote procedure call failed

As it is a clustered environment I have treid migrating the service to a
different physical node but get the same problem

This is into a Citrix environment.
Interestingly I can install from this iPrint installation ok if on a
conventional desktop ok

Before you get too excited I can install printers from a different iPrint
installation into this Citrix environment without getting the errors.

Cant find any reference to that error on the web

Any ideas on what to look for?