App Store 2.5.5 rejection: IPv6-only networks

Your home Wi-Fi test can pass while Apple’s network test fails. Guideline 2.5.5 requires the app to work on IPv6-only networks, so the problem may be an address or networking library rather than a broken server.

Trace the failing request

Ask your developer to reproduce the flow on an IPv6-only test network and record which service fails. Check hard-coded IPv4 addresses, custom socket code, embedded web content, and third-party SDKs. We’d test sign-in and uploads as well as the home screen.

Correct the network assumption

Use supported networking APIs and properly resolved hostnames instead of assuming an IPv4 address format. Update or replace dependencies that make the same assumption. Verify the fix in the actual app build; a website loading in a browser doesn’t prove every app request works.

Repeat the full flow on IPv6-only and ordinary networks. Give Apple the tested feature and build, plus a concise explanation of the networking change. If you still can’t reproduce the failure, ask for the affected endpoint or steps rather than claiming the network is supported without testing it.