Let's Debug

Test result for srimuang.ddns.net using http-01

No valid A or AAAA records could be ultimately resolved for srimuang.ddns.net. This means that Let's Encrypt would not be able 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 Nov 10 21:53:54 2023. Sat in queue for 4ms. Completed in 1s. Show verbose information.