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Private DNS server cannot be accessed when switching to Mobile (Bell Canada)

I have a Samsung S24 Ultra (this same thing was happening on my S23 Ultra as well). It is setup with Private DNS (netid.dns.nextdns.io). I've also tried with a hostname at the start (phone.netid.nextdns.io). I"m on Bell Mobility in Canda.

Quite often when I leave the house (mind you, it's not every time) I will find after a while that the connection isn't working. No site will come up, mail not received, no notifications. Upon investigation, the private DNS will read "Private DNS server cannot be access". If I flip it to automatic or none, it will immediately start working again. And when I flip it back to Private DNS, it will continue working.

I can't seem to nail down why this is happening.

A friend, same phone, also with NextDNS has no problems. The only thing I can find different in our setups is he's on a different cellular provider.

Not sure what to try next to troubleshoot. 

3 replies

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    • R_P_M
    • 2 wk ago
    • Reported - view

    Well, going on what you’ve said it’s most likely to be your cellular network provider that’s at fault. Seeing as you mentioned your friend with same setup on a different network works ok. 

      • Andy_Serwatuk
      • 2 wk ago
      • Reported - view

       Tha'ts fair.. but.. what would it be that the Cell provider is doing/blocking that could be the culprit?
      I'm happy to go toe to toe with their support team, but I'm not sure what I should be pointing at.

      • R_P_M
      • 2 wk ago
      • Reported - view

       Hmm… Not really sure what the exact lock out could be caused by. Could be some sort of connection timeout if no provider dns usage?

      There’s one thing you could try and that’s to use an app to get a DoH connection to NextDNS. If that also suffers the same problem then it could be some timeout condition being implemented. If it works constantly, then there’s some sort of restriction to DoT on the network. 

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