DNS-over-HTTPS (DoH) is a way to encrypt DNS queries and responses between your device and the DNS. It is an extra step you can take to improve browsing security.
Your DNS-over-HTTPS link can be found on your customer page in the "Control Tower Section":

How to enable DNS-over-HTTPS on your browser
Mozilla Firefox
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Select the menu button > Settings.
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In the General menu choose "Privacy & Security".
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Select "Max Protection" under the "Enable DNS over HTTPS using:" section and paste your DNS-over-HTTPS URL:

 
Google Chrome
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Select the three-dot menu in your browser > Settings.
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Select "Privacy and security" > Security.
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Scroll down and enable "Use secure DNS".
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Select the "Add custom DNS service provider" option and paste your DNS-over-HTTPS URL:

 
Microsoft Edge
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Select the three-dot menu in your browser > Settings.
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Select "Privacy, Search, and Services", and scroll down to Security.
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Enable Use secure DNS.
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Click the "Use secure DNS to specify how to lookup the network address for websites" switch to enable.
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"Choose a service provider" and paste your DNS-over-HTTPS URL:

 
Brave
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Select the menu button in your browser > Settings.
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Select "Security and Privacy" > Security.
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Enable "Use secure DNS".
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Select "With Custom" and paste your DNS-over-HTTPS URL:

 
