[CentOS] centos6 not using /etc/gdm/custom.conf

[Jamieson, Stephen CTR Navair, 5.4.4.4]

> Those options are no longer supported in GDM. I think that they were
> removed with GDM 2.24 (at the latest, probably 2.22) and C6 is running
> GDM 2.30.

That is unfortunate... I suppose I will just have to ignore this issue
then.

> in "/etc/gdm/custom.conf" to override the "-nolisten tcp" but I have
> no idea about "-br -audit 4 -s 15".

Thanks for your help.  I really wish someone know where I could edit
those parameters.  

Regards,

Stephen Jamieson