GFW also blocks via DNS, no?

It should not be, it seems to be a DNS issue.

67.07 Mbit/s 150.327 ms Germany, Berlin (DNS:NET) 69.55 Mbit/s 78.84 Mbit/s 163.863 ms Spain, Madrid (Adamo) 87.20 Mbit/s 103.74 Mbit/s 158.218 ms Italy, Rome (Unida

60.15 Mbit/s 267.117 ms Germany, Berlin (DNS:NET) 27.93 Mbit/s 84.99 Mbit/s 262.629 ms Spain, Madrid (Adamo) 49.33 Mbit/s 101.46 Mbit/s 245.266 ms Italy, Rome (Unida

43.09 Mbit/s 272.061 ms Germany, Berlin (DNS:NET) 37.67 Mbit/s 63.44 Mbit/s 289.731 ms Spain, Madrid (Adamo) 39.99 Mbit/s 44.28 Mbit/s 245.249 ms Italy, Rome (Unida

* Cheap HA using Cloudflare and round-robin DNS

* IPv4 and IPv6 reverse DNS can be set instantly by client at VPS control panel. On OpenVZ, TUN/TAP/GRE/PPTP/DAHDI/FUSE/IPTABLES can be enabled (KVM has it all).

432.50 Mbit/s 19.386 ms Germany, Berlin (DNS:NET) 415.17 Mbit/s 596.55 Mbit/s 13.885 ms Germany, Munich (InterNetX) 768.87 Mbit/s 1169.97 Mbit/s 5.967 ms Denmark, Copenh

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113.06 Mbit/s 150.480 ms Germany, Berlin (DNS:NET) 3.16 Mbit/s 107.41 Mbit/s 159.260 ms Spain, Madrid (Adamo) 107.38 Mbit/s 77.82 Mbit/s 155.293 ms Italy, Rome (Unidat

452.07 Mbit/s 21.386 ms Germany, Berlin (DNS:NET) 240.49 Mbit/s 452.73 Mbit/s 20.517 ms Spain, Madrid (Adamo) 260.28 Mbit/s 458.15 Mbit/s 29.309 ms Italy, Rome (Unidat

If they don't and you're stuck, check https://developers.google.com/speed/public-dns/docs/dns64 (there are other dns64 servers)

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@jsg how's your DNS server doing?

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on the account using a best-effort approach (DNS + wildcard, then domain validated per-domain). If you're migrating off a cPanel account, letsencrypt:bootstrap is automatically invoked at conclusion