ERR_CERT_COMMON_NAME_INVALID
ERR_CERT_COMMON_NAME_INVALID Error
What This Error Means
This error indicates a mismatch between the domain name in the address bar and the domain name listed on the SSL certificate. The browser blocks the connection because it cannot verify that the certificate belongs to the site you are visiting.
Common Causes
- Accessing a site via IP address instead of domain name.
- The certificate does not include the 'www' subdomain (or vice versa).
- A redirect is pointing to a domain not covered by the certificate.
- Using a certificate issued for a different domain on the same server.
How to Fix It (For Users)
- 1 Check if you typed the URL correctly.
- 2 Try accessing the site with or without 'www'.
- 3 Avoid using the IP address to access the site.
For Site Owners / Developers
- Ensure your certificate includes all variations of your domain (Subject Alternative Names).
- Configure redirects to point to the correct, secured domain version.
- Install the correct certificate for the specific virtual host.
When It Is NOT Your Fault
If the site is misconfigured to serve the wrong certificate.
Check if this outage affects everyone globally
This error often indicates a wider problem. Use our tool to verify if the site is down for everyone.
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