IssueFromLetsEncrypt
ERROR
A test authorization for handalwaterheater.co.id to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
103.229.73.17: Fetching http://handalwaterheater.co.id/.well-known/acme-challenge/omsr9Ha9KYqVIRdsAQJLTkdH5OJTii69eocQdYxDrz0: Timeout during connect (likely firewall problem)
Timeout during connect (likely firewall problem)
Edited and deleted; as nmap does not handle the curl parameter -A "Mozilla/5.0 (compatible; Let's Encrypt validation server; +https://www.letsencrypt.org)". Thus I made an error.
Do you have a Palo Alto Firewall installed or in between your server and the Internet?