Sometimes old DNS data is stored locally. Open your command prompt and type ipconfig /flushdns (on Windows) to clear the cache. Managing Policies for Administrators
Wait 5–10 minutes for the change to propagate across the global network. Customizing Block Pages cisco umbrella blocking sites
To reduce help desk tickets, administrators should customize the block page. Adding a "Request Access" button or a contact email directly on the block screen allows users to report legitimate sites that are being filtered incorrectly. The Role of the Roaming Client Sometimes old DNS data is stored locally