Flushing DNS cache

Flushing a device's DNS cache will ensure that any recent changes to sites blocked by Umbrella cannot be bypassed by a user who has a newly-blocked page in their browser's cache.

In Microsoft Windows

Type "cmd" into your Start menu
In the command prompt, type:

 ipconfig /flushdns

In Linux

In the terminal, type:

/etc/rc.d/init.d/nscd restart

This will restart the nscd daemon, flushing the DNS cache

In MacOS

In Terminal, type:

 lookupd -flushcache

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