Let's Debug

Test result for ix.zxinc.org using http-01

ix.zxinc.org has an AAAA (IPv6) record (2406:840:803:1::2) but a test request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address. You should either ensure that validation requests to this domain succeed over IPv6, or remove its AAAA record.
A timeout was experienced while communicating with ix.zxinc.org/2406:840:803:1::2: Get "http://ix.zxinc.org/.well-known/acme-challenge/letsdebug-test": context deadline exceeded

@0ms: Making a request to http://ix.zxinc.org/.well-known/acme-challenge/letsdebug-test (using initial IP 2406:840:803:1::2)
@0ms: Dialing 2406:840:803:1::2
@10000ms: Experienced error: context deadline exceeded
A test authorization for ix.zxinc.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
2406:840:803:1::2: Fetching http://ix.zxinc.org/.well-known/acme-challenge/1L4Wbjx4T-uQHAyCP3Ll7xvQx41WZo8lmYOmSJ2In_c: Timeout after connect (your server may be slow or overloaded)

Submitted Jul 10 16:05:20 2022. Sat in queue for 7ms. Completed in 1m33s. Show verbose information.