CertPost
certpost.ai
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Overview
CertPost checks the certificate your server actually serves: chain, hostname, and expiry. It alerts you by email or webhook before a certificate causes an outage. Unlimited certificates for $29/month. 3 free forever.
News
Too many certificates already issued for this exact set of domains.
Let's Encrypt refused the renewal because something already burned the quota. How to read which limit you hit, find the loop that spent it, and get a certificate back on the wire without waiting a week.
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Renewal failed. Root mail never left the box.
Certbot has been logging renewal errors for weeks. The notices went to root on a server with no mail relay - or to a journal nobody reads. How to find the errors, read what went wrong, and route alerts somewhere that reaches you.
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The certbot timer is not running.
certbot.timer inactive, masked, or never installed. No renew runs. The leaf on :443 ages until a browser warns. Prove the timer, enable it, then watch expiry off-box.
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HTTP-01 died after you forced HTTPS.
Certbot needs /.well-known/acme-challenge/ on port 80. A blanket HTTP-to-HTTPS redirect or auth wall returns 404 or unauthorized. Prove the path, carve an exception, renew, then watch expiry off-box.
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nginx reloaded nothing. Certbot still exited 0.
Certbot wrote a new fullchain.pem and exited 0. openssl on :443 still shows last month's notAfter. Prove disk vs wire, reload nginx, add a deploy hook.
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