On 21 Sep 2017 17:10, "Valeri Galtsev" <galtsev at kicp.uchicago.edu> wrote: Dear Experts, "this is system from the hell!" Than was my first reaction when I realized that logged in with GUI (X11) user can turn off (and on) network interfaces. Without being in sudoers file. Wow, this is scary to see on workstations I manage centrally. Even though I did consider local user to be able to execute the command "shutdown" (which distinguished RedHat and CentOS from other Linux flavors: after all local user can yank power cord off the wall). Sorry about my little rant above. Could someone point me into right direction as to how do I disable the ability of (local, logged in through X11) users to fiddle with network interfaces. Even worse, they can create new profile and define for interfaces to behave differently... In the past I could just add USERCTL="no" into interface ifcfg-... file inside /etc/sysconfig/network-scripts which doesn't seen to have any effect on latest CentOS 7. What is my pilot error here? (Ignorant in new shiny extremely MS Windows like for _ignorant_ person - me - system). Thanks a lot for all your help! Valeri On the commute home so access to resources to test is limited. This will no doubt be handled through polkit policy. This should at least set you on the right path to discover and configure the appropriate bits... https://www.hogarthuk.com/?q=node/10