What it is

The site's SSL/TLS certificate has expired. Every visitor's browser shows a full-page security warning before they can even reach the site — this kills trust immediately and hurts search rankings.

How to fix it

Renew the certificate. Most hosts renew Let's Encrypt/AutoSSL certificates automatically — check with your host why that renewal didn't happen.

In depth

Your website's security certificate has expired, which is like having a lock on your door that's officially outdated. When visitors try to access your site, their browser displays a big red warning message saying the connection isn't safe, and many people will turn back without even trying to reach your site. This broken certificate hurts your business in two ways: you lose potential customers who get scared away by the warning, and Google penalizes your search rankings because it considers expired certificates a security risk. The good news is that fixing this is straightforward and usually free. Contact your web hosting company and ask them to renew your SSL certificate right away, and in most cases they have an automatic renewal system they can enable so this never happens again. If your host uses Let's Encrypt or AutoSSL (which many do), simply ask them to manually trigger the renewal or to check why the automatic process failed. Once renewed, the warning disappears completely within hours, your site becomes trustworthy again, and your search visibility will recover.