zypher.synology.me has an A (IPv4) record (202.53.39.36) 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 zypher.synology.me/202.53.39.36: Get "http://zypher.synology.me/.well-known/acme-challenge/letsdebug-test": dial tcp 202.53.39.36:80: i/o timeout
Trace:
@0ms: Making a request to http://zypher.synology.me/.well-known/acme-challenge/letsdebug-test (using initial IP 202.53.39.36)
@0ms: Dialing 202.53.39.36
@10000ms: Experienced error: dial tcp 202.53.39.36:80: i/o timeout
A test authorization for zypher.synology.me to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://zypher.synology.me/.well-known/acme-challenge/CcK5RnvfQJfzoWCKWE_MHsJyXqTlmd7qrwG_5h1EMRI: Timeout during connect (likely firewall problem)
The current status as reported by the Let's Encrypt status page is Service Disruption as at 2021-04-18 20:35:12.253 +0000 UTC. Depending on the reported problem, this may affect certificate issuance. For more information, please visit the status page.
https://letsencrypt.status.io/