Open the Terminal from your Applications menu. In the Gnome desktop environment you should find the Terminal in System Tools.

In Linux, the nscd daemon manages the DNS cache, To flush the DNS cache, you will need to be logged in as root so you can restart the nscd daemon. Type the following command and hit enter to log in as root: su -

Next, type this command to restart the nscd daemon: sudo /etc/rc.d/init.d/nscd restart
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