I’ve faced this issue on all my Android phones across various Android versions.
When I have NextDNS enabled as my private DNS, my phone isn’t able to communicate with my dashcam (Yi Nightscape). I can join the WiFi connection created by the dashcam but the dashcam’s app isn’t able to connect to the dashcam. I have to go into the settings and turn off Private DNS, then remember to turn it back on once I’m done.
Nothing shows up in the logs for me to allowlist, and I can’t seem much information regarding it online as well. I don’t think NextDNS even has a pause button to temporarily disable it.
I don’t have knowledge about networking to even know how to troubleshoot, or whether I’m even describing the issue properly. I was hoping someone with more insight could help me with this.
When you’re on private DNS, only global (public internet) hostnames will resolve. For anything on your local network, only IP addresses will work.
There’s a chance that your dashcam has its own DNS server, or registers its hostname with your router’s DNS server. Either way, you’ll only get the right answer from that server.