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title: "Certificate issuance outage"
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# Certificate issuance outage

[← View full Infra Log](https://fly.io/infra-log/)

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July 2: Certificate issuance outage (21:40UTC)

We issue certificates using [Let’s Encrypt](https://letsencrypt.org/), who had a [networking hiccup](https://letsencrypt.status.io/pages/incident/55957a99e800baa4470002da/6a3416f4f7a0500610c184c5) when failing over datacenters for maintenance. This caused some requests to fail, making our issuance jobs bail out and re-queue themselves. Apart from a handful of lucky hostnames who squeaked through, certificate issuance was out of action for a few hours. We renew certificates well before they expire, so no existing traffic was affected. Any apps that were in the process of setting up their hostname would have seen a delay in getting their first certificate. Once the upstream incident was resolved, all queued issuances and renewals were processed.