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Firefox Bypassing NextDNS?

I've noticed that if I use the attached settings in Firefox it seems to bypass sites I want to be blocked in NextDNS. What am I missing here? Shouldn't the blocking still work?

NextDNS is configured on my Unifi UDM-Pro if that matters. I'm using https://github.com/nextdns/nextdns

6 replies

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    • R_P_M
    • 3 yrs ago
    • Reported - view

    That particular Firefox setting will be using NextDNS without your custom settings. Just keep it disabled or use custom provider string from my.nextdns.io browser setup, not “NextDNS” option.

      • Aaron_Westley
      • 3 yrs ago
      • Reported - view

      R P M Drats. Ok. Seems like an easy way to circumvent the filters. Thank you.

      • R_P_M
      • 3 yrs ago
      • Reported - view

      Aaron Westley Ah right, you’re wanting to secure that device. Difficult to stop that from being set. 
      Good luck with your endeavour. 

    • whosnext
    • 3 wk ago
    • Reported - view

    One way to resolve this is to use force a specific DNS resolver using Firefox policy templates.

    Put this in your policies.json file:

    {
  "policies": {
    "DNSOverHTTPS": {
      "Enabled": true,
      "Locked": true,
      "ProviderURL": "https://dns.nextdns.io/ID/JohnsFirefox"
    }
  }
}

    Replace `ID` with your NextDNS ID from the setup page, and `JohnsFirefox` with whatever you want the reporting name of that browser to be.
     

    • Onyx_Digital
    • 16 hrs ago
    • Reported - view

    Make sure you're NextDNS is set at OS level. Over rides any browser perms. So ensure the toggle that "blocks attempts at bypassing nextDns" is on. 

      • whosnext
      • 14 hrs ago
      • Reported - view

       This will not help in this case, because NextDNS is not going to block bypassing using NextDNS!

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