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To catch an expiring TLS certificate before visitors encounter a browser warning, track who owns each certificate, verify that renewal is actually eligible and working, and send alerts to a person who can resolve validation or deployment problems. For AWS Certificate Manager (ACM), automatic renewal has conditions; it is not a substitute for monitoring.
Start with a complete certificate inventory
Record every client domain and subdomain, the certificate serving it, where that certificate is installed, its expiration date, its validation method, and the person responsible for acting on it. Include certificates imported into cloud services as well as certificates issued by ACM. An alert is only useful if it reaches someone who knows which site and service it affects.
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- Domain names covered, including relevant subdomains
- Certificate issuer and whether it was issued by ACM or imported
- AWS service using the certificate, if applicable
- Expiration date and validation method
- Named owner and monitored alert destination
How do I know if my SSL certificate will renew?
For ACM, first distinguish an ACM-issued certificate from an imported certificate. ACM manages renewal only for eligible certificates it issued. Imported certificates do not receive ACM managed renewal; AWS says customers must monitor their expiration and renew them before they expire. Eligibility for an ACM-issued certificate depends on criteria including its association with an integrated AWS service or whether it has been exported. Check the current ACM managed renewal documentation for the certificate’s circumstances.
Even an eligible certificate can require action if renewal validation fails. For a DNS-validated ACM certificate, the certificate must be in use by an AWS service, and the required ACM CNAME records must remain present and publicly accessible when ACM checks renewal. If records were removed or changed, renewal may not complete. AWS describes these requirements in its DNS validation renewal guidance.
Check renewal status, not just the expiration date
Review the certificate’s renewal status in the ACM console, through the API or CLI, or in the AWS Health Dashboard. Status distinguishes conditions such as pending automatic renewal, pending validation, success, and failure. A pending validation or failure is a cue to investigate rather than assume the date alone tells the story. AWS also notes that some status changes can take time to appear, so a status update may not be instantaneous. See how to check ACM certificate renewal status.
How to get an alert before a certificate expires
For ACM certificates, create an Amazon EventBridge rule for approaching-expiration events and route notices to a monitored channel or incident queue. AWS documentation retrieved on October 7, 2026, says ACM emits daily events beginning 30 days before expiration for public certificates and 45 days before expiration for private or imported certificates. These documented thresholds may change; check the current ACM events reference when configuring a rule.
Do not stop at the approaching-expiration event. AWS recommends monitoring renewal events, automating deployment after renewal, and alerting on renewal or deployment failures. A renewed certificate is not operationally complete until the service presenting it has deployed the replacement successfully. See AWS guidance on managed renewal and monitoring ACM with EventBridge.
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- Include the domain or certificate identifier and the affected AWS service in the alert where available.
- Route it to a monitored destination with a named owner and an escalation path.
- Define what the owner should check: renewal status, DNS validation, or post-renewal deployment.
- Periodically exercise the notification route and inspect certificate status. AWS documents the events and status mechanisms; that does not establish that your own notification path is being tested automatically.
Handle imported certificates as a separate renewal workflow
Imported certificates are not covered by ACM managed renewal. An approaching-expiration event can serve as a reminder or trigger automation, but the operator remains responsible for obtaining a replacement and importing it before the current certificate expires. Track issuance and deployment as separate completion checks: receiving a replacement does not prove that the service is presenting it.
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Keep the scope of AWS monitoring clear
These steps apply to AWS Certificate Manager and Amazon EventBridge. Other certificate authorities, registrars, hosting control panels, content delivery networks, and load balancers may have different renewal requirements and notification systems; verify their current official documentation rather than assuming AWS behavior applies. For an agency managing mixed infrastructure, assess whether its monitoring discovers every domain and certificate—including imported and non-AWS certificates—whether warning lead times are configurable, whether alerts cover validation and deployment failures, who owns each alert, and whether the live certificate presented to visitors is checked.
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