Let's Debug

Test result for chenla.org using http-01

Fatal
No valid A or AAAA records could be ultimately resolved for chenla.org. This means that Let's Encrypt would not be able to to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.

Submitted Oct 22 14:23:42 2021. Sat in queue for 3ms. Completed in 1s. Show verbose information.