Cannot Run Software Update over NX Connect session. - Red Hat Customer Portal

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Issue

When trying to run Gnome Software Update (packagekit) over an NX Connect v4 connection. Software Update will launch, load the update list, but then never prompt for administrator authentication.
The issue is not reproducible on console of system, software update is working fine. The issue is specific to NX connection only.
Why am I not able to run gui administrative tools over the NX Connect session which prompt for authentication(eg: 'system-config-users' and 'system-config-lvm')?

Environment

Red Hat Enterprise Linux 6
nomachine(version 4)

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