If you manage websites on a cPanel server, you have probably encountered AutoSSL at some point. AutoSSL is cPanel’s automated mechanism for provisioning and renewing free SSL certificates—typically from Let’s Encrypt or cPanel’s built-in Comodo certificate authority. It runs on a daily schedule and attempts to secure every domain and subdomain on the server. When it works, it eliminates the hassle of manual certificate renewals. When it breaks, however, the result can be a confusing wall of warnings in your cPanel interface and, worse, browser security errors for your visitors.
The most common AutoSSL failures include certificates that never provision, domains stuck in “pending validation,” mixed-content warnings after installation, or the dreaded “AutoSSL is currently unavailable” message. Each of these failures has a root cause—often related to DNS propagation, cPanel user permissions, or server-level configuration issues. In this guide, you will learn how to diagnose the most common AutoSSL errors and resolve them without needing to escalate to your hosting provider.