When I try to open any graphical tool that demands the root password, it won't launch after I enter the password. I have tried the "Authentication" and "Date and Time" apps, for example. When I try to launch the app from the command line by typing
system-config-authentication, it says:
No protocol specified Unable to initialize graphical environment. Most likely cause of failure is that the tool was not run using a graphical environment. Please either start your graphical user interface or set your DISPLAY variable.
This happens whether I am using Gnome or KDE. This is on CentOS 6.5.
Edit: I installed CentOS as dualboot with windows 7 in laptop + i'm not using SSH and yes i'm in graphical environment when i run the command.