Change the setting to one listed below and select the checkmark on the right.Replace the URI with your preferred DNS resolverĮnabling Trusted Recursive Resolver (TRR) mode affects how Firefox switches between DNS resolvers to improve DNS-over-HTTPS (DoH).QuadDNS, Quad101, or another resolver listed in the curl Github page or AdGuard listing)įor more advanced options, you can edit the Firefox configuration file directly. (Optional) Change your default DNS provider from Cloudflare to NextDNS or Custom (e.g.Under Network Settings, select Settings.The easiest, preferred option is to use the browser preferences menu. There are two ways to enable DoH in Firefox: Preferences Menu Check your internet access after changing each setting to help you troubleshoot any issues you have. Some changes may affect connectivity to your local network resources. You should note your current settings before changing anything. Encrypted SNI is enabled by default with the Cloudflare DNS resolver. Encrypting SNI is another way to secure your web activity from man-in-the-middle (MITM) attacks. What is Encrypted SNI? The Server Name Indication (SNI) shares the hostname for outgoing TLS connections in plain-text. Learn more about the concerns with DoH and DoT at .ĭoH can negatively affect the performance of some content delivery networks (CDNs) including Cloudflare and MaxCDN. There are cybersecurity and enterprise professionals concerned about whether DoH actually improves internet security and/or adds issues that negate its benefits. Learn more about why Firefox implemented DoH instead of DoT. DNS-over-HTTPS (DoH) travels alongside other SSL connections and has more support than DNS-over-TLS (DoT). DoT is easy to block because although you won’t see the encrypted traffic, it’s using a dedicated port. DoT uses a dedicated port (853) for DNS queries over TLS but doesn’t require the user system to authenticate the requested server. What is DNS-over- HTTPS ( DoH )? DoH encrypts DNS traffic with HTTPS (port 443) and HTTP/2 and requires authentication of the requested server.ĭNS-over-HTTPS (DoH) or DNS-over-TLS (DoT)? Each handles DNS differently. These newer DNS security features help protect user privacy during web activity. Starting in Firefox 73, users can easily use DNS-over-HTTPS (DoH) and Encrypted Server Name Indication (SNI) for better privacy without extra software.
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