Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
5 guides match “failed renewal”.
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Fundamentals Reading time: 3 min
Let's Encrypt no longer sends expiration emails: how to stay informed
Since June 4, 2025, Let's Encrypt no longer warns you before a certificate expires. Why this safety net is gone, and how to replace it.
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Tutorials Reading time: 3 min
Creating a free SSL certificate with Let's Encrypt and Certbot
Install Certbot, get a certificate for Nginx or Apache, handle wildcards and make sure automatic renewal really works.
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Troubleshooting Reading time: 3 min
NET::ERR_CERT_DATE_INVALID error: causes and fixes
What the "Your connection is not private" error tied to the certificate date means, how to tell whether the problem is on the site or the visitor's side, and how to fix it.
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Troubleshooting Reading time: 4 min
Troubleshooting the most common SSL errors
Expired certificate, name mismatch, incomplete chain, mixed content: how to identify the cause of the error and fix it.
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Tutorials Reading time: 4 min
Setting up your expiration alerts
Choose the channels (email, Slack, Telegram, webhook), when reminders go out and who gets them, and turn on reports.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.