NextDNS and Spectrum Internet fighting
Today my Internet stopped working and after some extensive debugging, I was able to track down the symptom. When I put the NextDNS servers into into my router configuration, it causes my cable modem to disconnect from the internet -- consistently.
This is a new problem starting today, so I suspect either NextDNS or Spectrum has done something with respect to encrypted DNS and this conflict causes my cable modem to essentially stop. External resets don't restore it. Only a hard power down.
Any reasons or fixes. I really like NextDNS but I cannot use it if it disables my cable modem.
Can you provide more detail?
What Modem are you using (Brand, Model number , Hardware/Firmware version)
Who is your Internet Service Provider?
What setting's did you input? were they just the IP addresses?
Did the connection drop the very moment you updated the Primary & Secondary DNS?
Do you have any log's that you can share from your Modem or the tool's used? (Removing any Personal details, login credentials)
I use spectrum also but the modem they provided me doesn't have wifi capabilities, so I use a 3rd party mesh router. I haven't had any problems but if you're using their modem and it has wifi capabilities then they maybe be blocking NextDNS, if that turns out to be the case then you may have to get a 3rd party router and setup NextDNS on it instead and disable wifi on your ISP-provided modem/gateway.
It's also possible spectrum may just be experiencing a service disruption, I would also check if there's a local spectrum outage, as it would explain your modem consistently disconnecting today (especially if you've previously haven't had this problem)