Ssl works under 4G but fail under wifi

Some of our customers meets ssl connection issues. It works fine when they use 4G but fails under wifi.

I have set the minimun tls version to tlsv1.2. but still not work.

Does ipv6 cause this issue?

need help.

Thanks


It looks like a local DNS resolution error on that WiFi, as that’s not a Cloudflare IPv6 proxy address.

I change the advance ssl certificate to universal ssl certificate. It works fine now. So I guess it still certificate issue?

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