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My site works on Wi-Fi but not on mobile data. What should I check?
Test the same address on both connections and note the exact error message. Temporarily disable your VPN, if you use one, and try another browser. If you recently changed DNS settings, the networks may still be using different cached responses.
Check that your A and AAAA records point to the correct destinations. An incorrect AAAA record can affect IPv6 access even when the site works over IPv4. Do not delete records at random: confirm the configuration with your provider. Also check for firewall or CDN blocks. When requesting an investigation, provide the test time, network used and error observed, without posting sensitive details publicly.
