NET::ERR_CERT_AUTHORITY_INVALID is a common error that occurs when a web browser can’t verify the authenticity of an SSL certificate because it’s not issued by a trusted Certificate Authority (CA). If a website's certificate isn't stamped by someone on that list, or if something else is off with the certificate, your browser returns this error as a safety measure.

So, in plain language, this error means your browser can't verify if the website's security certificate is legitimate, making it potentially risky to proceed.

How does the NET::ERR_CERT_AUTHORITY_INVALID error happen?

There are a few common reasons why you might encounter this error.

• Self-signed certificate. When an SSL certificate is created without being signed by a trusted Certificate Authority, it can trigger this error.
• Expired certificates. Security certificates have an expiration date. If a website forgets to renew theirs, browsers will see it as invalid.
• Untrusted CA. There are many organizations that issue SSL certificates, but not all are universally trusted by browsers. If a website uses a certificate from a CA that your browser doesn't recognize, you'll get this error.
• Mismatched domain. The security certificate is issued for a specific website address. If the certificate on a site doesn't exactly match the web address you typed in, the browser will raise a red flag. 
• Improper configuration. Sometimes, the website's server might not be set up correctly to present the SSL certificate to your browser. 

How to fix the NET::ERR_CERT_AUTHORITY_INVALID error

If you're seeing this error while working on your own website, here's what you should look into.

1. Check the SSL certificate. Make sure it's current, valid, and was issued by a reputable Certificate Authority.
2. Update the certificate. If your certificate has run out, get a new one from a trusted CA.
3. Install the root certificate. While self-signed certificates have their uses (like for internal testing), for public-facing websites, it's best to use one from a well-known CA.
4. Correct domain mismatch. Ensure the certificate you have is for the exact web address of your site.
5. Configure SSL properly. Make sure your server is properly set up to handle SSL and that any necessary intermediate certificates are installed.

Spotting a valid SSL certificate

Want to know if a website you're visiting has a good SSL certificate? Here's how to check.

• Use an SSL checker. There are free tools online where you can enter your website's address and it will analyze the SSL certificate for any issues.
• Browser inspection. You can click on the padlock icon to view details about the SSL certificate, including who issued it and when it expires.
• Contact your hosting provider. If you're managing a website and are unsure about your SSL, your hosting company can usually help you verify its status.

FAQs about NET::ERR_CERT_AUTHORITY_INVALID

Why do I see the NET::ERR_CERT_AUTHORITY_INVALID error on my website?

This error usually appears when your SSL certificate is not issued by a trusted Certificate Authority, or there’s an issue with your certificate’s configuration.

How can I avoid the NET::ERR_CERT_AUTHORITY_INVALID error when building a website?

The key is to use a valid SSL certificate from a trusted Certificate Authority and ensure it's correctly installed and configured on your server. Keep it up to date!

Can I fix the NET::ERR_CERT_AUTHORITY_INVALID error myself?

Usually, no. This is an issue with the website's configuration. While you might be able to temporarily bypass the warning in your browser (which isn't recommended for security reasons), the website owner needs to fix the underlying problem.

Is the NET::ERR_CERT_AUTHORITY_INVALID error harmful to my website?

Absolutely. This error can scare away visitors as it makes your site appear insecure. It's crucial to have a valid SSL certificate to build trust and protect your users.

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