Let's Debug

Test result for t42.dyndns.org using http-01

Error
t42.dyndns.org has an A (IPv4) record (78.30.56.133) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
A timeout was experienced while communicating with t42.dyndns.org/78.30.56.133: Get "http://t42.dyndns.org/.well-known/acme-challenge/letsdebug-test": dial tcp 78.30.56.133:80: i/o timeout

Trace:
@0ms: Making a request to http://t42.dyndns.org/.well-known/acme-challenge/letsdebug-test (using initial IP 78.30.56.133)
@0ms: Dialing 78.30.56.133
@10001ms: Experienced error: dial tcp 78.30.56.133:80: i/o timeout
A test authorization for t42.dyndns.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
78.30.56.133: Fetching http://t42.dyndns.org/.well-known/acme-challenge/o4LRJ8MwpKoeZOzCfm8FGW-hoz-ZVnoqPXzSshDmm4M: Timeout during connect (likely firewall problem)

Submitted Nov 7 18:46:02 2022. Sat in queue for 4ms. Completed in 23s. Show verbose information.