I used to experience this issue when I had manually configured my DNS over HTTPS (DoH) settings on Firefox for Android in about:config, and had set network.trr.

I used to experience this issue when I had manually configured my DNS over HTTPS (DoH) settings on Firefox for Android in about:config, and had set network.trr.mode to 3 (force DoH). Changing it to 2 (prefer DoH, use normal DNS as fallback) fixed the issue for me. https://wiki.mozilla.org/Trusted_Recursive_Resolver#DNS-over-HTTPS_Prefs_in_Firefox https://wiki.mozilla.org/Trusted_Recursive_Resolver#DNS-over...