TCP 80 is blocked by China Telecom, to get your own cert, turn off your httpd running at port 443 and then:
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certbot certonly --standalone --standalone-supported-challenges tls-sni-01 -d domain1 -d domain2 |
Letsencrypt when Port 80 is Blocked by @sskaje: https://sskaje.me/2016/07/letsencrypt-port-80-blocked/
Link to this post!