Why does my website go down unexpectedly due to SSL expiries?

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Photo: Salvatore Ventura (CC0)

Spotlight

PAGE: https://alison.com/course/exploring-and-installing-let-s-encrypt-using-ssl-certificate

PROMISE: Use automated renewal systems to prevent manual certificate checks from causing outages.

WHO: Administrators managing their own servers who want to automate security updates.

WHYNOW: Manual tracking of certificate expiries is a common cause of preventable outages.

DESC: Learn about the importance of SSL certificates, the process of installation and renewal as well as how to configure it in the cloud computing environment.

BEFORE: Reliance on manual calendars for expiry dates.

BEFORE: No automatic check for certificate status.

BEFORE: High risk of unannounced downtime.

AFTER: Renewals run on a scheduled automatic task.

AFTER: System verifies status without human checking.

AFTER: Downtime from expiry is prevented by automation.

GAIN: Ability to set up automated renewal via cron jobs.

GAIN: Knowledge of how to configure servers for new certificates.

GAIN: Understanding of why consistent renewal prevents outages.

STEP: The site goes offline because the admin forgot to manually update the expired certificate. || State the importance of renewing SSL certificates || Set up a renewal policy so the system handles expiration dates without human intervention.

STEP: The dashboard shows no alert for a certificate that is about to lapse in two weeks. || Explain the steps involved in installing cron job || Install a scheduled task to check and renew certificates automatically at set intervals.

STEP: The server configuration is incomplete and the new certificate does not activate. || Outline the process of configuring servers || Apply the correct server settings to ensure the renewed certificate deploys properly.

NOTFOR: Learners needing a fully managed solution with no server access.

NOTFOR: Beginners unfamiliar with command line administration tasks.

FACT: Average duration: 4-5 Hours (Contains Video)

FACT: CPD-accredited certificate available

FACT: Advanced level

COVERS: Compare traditional and SSL certificates

COVERS: Identify the different types of SSL certificates

COVERS: Explain how SSL works

COVERS: Outline the steps involved in obtaining an SSL certificate

COVERS: Outline the process of configuring servers

COVERS: Discuss how to create droplets

COVERS: State how to use a console to administer a new server

COVERS: Explain how to verify the status of an SSL certificate on SSL Labs website

COVERS: State the importance of renewing SSL certificates

COVERS: Explain the steps involved in installing cron job

COVERS: Web Development

MODULE: Introduction to SSL Certificates || SSL Certificates | Types of SSL Certificates | Using Let’s Encrypt

MODULE: Creating Droplets || Preparation Steps | Creating Droplets | Configuring a Virtual Machine

MODULE: Installing Let’s Encrypt || SSL Labs Website | The Base Domain | Renewing SSL Certificates

What you are probably seeing

Your monitoring dashboards show sudden spikes in error rates or SSL handshake failures during traffic hours. You discover the outage only after customer complaints arrive, revealing that a certificate expired days ago without any prior warning.

You review your infrastructure logs and find that the domain name service still points to your server, but the TLS layer has stopped responding. The visual evidence is a broken padlock icon and browser warnings that appear simultaneously across all pages.

Why it happens

Manual renewal processes rely on human memory or static calendar reminders that are easily missed when teams are busy with other priorities. The gap between the last successful renewal and the next required one creates a window where the system operates normally but is technically already failing.

Modern public trust models have shifted toward shorter certificate lifetimes, meaning the frequency of required updates has increased significantly. Systems that were not designed for this high velocity of turnover treat the expiry as an edge case rather than a regular operational state.

What changed recently

2026-10-06 · Automate SSL Certificate Renewal in Kubernetes with cert-manager
Kubernetes teams now automate this gap:
• Cert-manager renews before expiry
• Public certs cap at 200 days
• Let’s Encrypt shortens to 64 days
Source: how_devto_security

Step by step

1. Audit all current SSL and domain assets to identify their specific expiration dates and current renewal methods. Create a single source of truth document that lists every certificate and its owner.

2. Implement an automated certificate management tool that can issue and renew certificates for your public domains without manual intervention. Configure it to run checks at regular intervals rather than waiting for the expiry date.

3. Set up automated monitoring that alerts you when a certificate is nearing its expiration threshold, allowing time for manual review if the automation fails. Ensure the alerts go to a channel that is actively monitored during business hours.

4. Review your Kubernetes manifests or server configurations to ensure they are set to auto-reload when new certificate files are deployed. This prevents the need to restart services manually after every renewal cycle.

5. Conduct a manual test by temporarily forcing a renewal to verify that the entire pipeline from issuance to application works correctly. Document any errors found in the process so they can be fixed before the next real outage.

Ways to go further

Start here: Personal Development courses For when you are setting up staging for testing. Open the free course on Alison ↗

Better fit: it courses For when you need to meet the new 100 day cap. Open the free course on Alison ↗

Best when: Exploring and Installing Let’s Encrypt Using SSL Certificate For when you want to stop manual certificate checks. Open the free course on Alison ↗

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