how can I disable user list that has been logged, at least, one time into X environment in Gnome running CentOS..

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I need to reconfigure Gnome in CentOS for avoiding that a normal user could lock screen using task bar option and/or Super L key (Windows Key + L). How could I configure Gnome? I need to do that in several computers, so I cant do login in X environm..

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After installing CentOS 7 in a server with 2 NICs, system detects eth0 and eth1 in reserve order. I would like to have eth1 as eth0 and eth0 as eth1. I have forced HWADDR attribute in /etc/sysconfig/network-scripts/ifcfg-etc{0,1}, but after rebooti..

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