SSL work on older servers is rarely about one clean failure. It is usually a mix of outdated tooling, confusing renewal output, and the question of whether the certificate path is truly broken or just neglected.

This note came from a Thumbor host where the renewal story looked worse than it really was.

The Symptom

The scheduled renewal logs were showing repeated failures for the existing certificate. The host was still using certbot-auto, which is already a warning sign by itself.

The cron entry in the note looked like this:

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0 0 * */2 * /bin/bash /root/letsencrypt/letsencrypt-auto renew >> /var/log/renew.log

And the logs included the expected warning:

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certbot-auto and its Certbot installation will no longer receive updates

That warning matters. Even when renewal still works, running on abandoned tooling is a maintenance risk.

What I Checked

The note kept a few public image URLs around for validation, which is a practical touch. When fixing SSL on an image or proxy service, I like having a quick way to confirm the endpoint is actually serving traffic again after the certificate work.

More importantly, I checked the renewal process manually:

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/root/letsencrypt/letsencrypt-auto renew

What the Manual Run Showed

The interesting part was that the manual renewal succeeded.

The log showed:

  • the certificate was due for renewal
  • the http-01 challenge completed
  • nginx reloaded
  • the certificate path updated successfully

That immediately changed the shape of the problem.

Instead of “Thumbor SSL is broken”, the more accurate reading became:

  • the host is on an outdated Certbot path
  • the scheduled renewal story is fragile
  • but the certificate flow itself still works when run directly

The Real Takeaway

This is why I keep notes from the command line, not just conclusions.

The presence of scary warnings from certbot-auto can make it feel like the whole SSL path is dead. But if the manual renewal works, then the operational problem may be less about certificate issuance and more about:

  • outdated tooling
  • neglected automation
  • poor visibility into renewal behavior

What I Would Change Today

If I were touching this host now, I would treat the successful manual renewal as a temporary reprieve, not a clean bill of health.

The next move would be to get off certbot-auto and onto a supported Certbot installation path, then re-check the renewal automation from there.

That is the difference between fixing the immediate symptom and actually reducing the future maintenance risk.