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Document certificate minimum validtity period for automatic renewal (#35816)

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Marko Lisica 2025-11-19 22:29:22 +01:00 committed by GitHub
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articles/connect-end-user-to-wifi-with-certificate.md
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@ -484,6 +484,8 @@ SELECT 1 FROM certificates WHERE path = '/opt/company/certificate.pem' AND not_v
Fleet will automatically renew certificates on Apple (macOS, iOS, iPadOS) hosts 30 days before expiration. If the entire validity period is less than 30 days (e.g. 20 days), Fleet will automatically renew at half the validity period (e.g 10 days).
Automatic renewal is only supported if the validity period is set to 2 days or longer.
If an end user is on vacation (offline for more than 30 days), their certificate might expire, and they'll lose access to Wi-Fi or VPN. To reconnect them, ask your end users to temporarily connect to a different network so that Fleet can deliver a new certificate.
> Currently, for NDES, Smallstep, and custom SCEP CAs, Fleet requires that the ⁠`$FLEET_VAR_SCEP_RENEWAL_ID` variable is in the certificate's OU (Organizational Unit) for automatic renewal to work. For some CAs, including [NDES](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/active-directory-domain-services-maximum-limits?utm_source=chatgpt.com#:~:text=OU%20names%20can%20only%20be%2064%20characters%20long.), the OU has a maximum length of 64 characters so any characters beyond this limit get truncated, causing the renewal to fail.