How to fix NET::ERR_CERT_AUTHORITY_INVALID error

If you receive the following error when visiting a website:

NET::ERR_CERT_AUTHORITY_INVALID

it means that your browser does not trust the SSL certificate presented by the website.

This error indicates that the certificate authority (CA) that issued the certificate could not be verified, causing the browser to warn that the connection may not be secure.

Common Causes

Self-Signed Certificate

One of the most common causes is the use of a self-signed SSL certificate.

A self-signed certificate is generated locally by the server administrator and is not issued by a trusted certificate authority.

Because browsers cannot verify its authenticity, they display a warning.

Expired SSL Certificate

If the SSL certificate has expired, browsers may reject it and display certificate-related errors.

Invalid Certificate Chain

The certificate may be valid, but the server may be missing one or more intermediate certificates required to establish trust.

Untrusted Certificate Authority

In rare cases, the certificate authority itself may no longer be trusted by modern browsers or operating systems.

Incorrect Server Configuration

SSL/TLS misconfiguration can result in browsers being unable to validate the certificate properly.

How to Troubleshoot

Check the Website Date and Time

Before assuming the problem is with the website, verify that your computer’s:

• Date
• Time
• Time zone

are configured correctly.

An incorrect system clock can trigger certificate validation errors.

Test the Website in Another Browser

Open the website using a different browser to determine whether the issue is browser-specific.

Clear SSL Cache

On Windows:

1. Open:

Internet Options

2. Go to:

Content

3. Click:

Clear SSL State

Verify the SSL Certificate

Check:

• Certificate expiration date
• Issuing authority
• Domain name listed in the certificate

You can usually view these details by clicking the padlock icon (if available) in the browser address bar.

If You Manage the Website

Verify the Certificate Installation

Ensure that:

• The certificate is valid.
• Intermediate certificates are installed correctly.
• The certificate matches the domain name.

Renew the Certificate

If the certificate has expired, renew it and reinstall it on the server.

Replace Self-Signed Certificates

For public websites, use a certificate issued by a trusted certificate authority such as:

• Let’s Encrypt
• Sectigo
• DigiCert
• GlobalSign

instead of a self-signed certificate.

Websites Hosted on mybox

If the affected website is hosted on mybox and you encounter:

NET::ERR_CERT_AUTHORITY_INVALID

please contact the support team through the 24/7 Helpdesk.

When submitting your request, include:

• The website address
• A screenshot of the error (if possible)
• Information about when the issue first appeared

This will help speed up diagnosis and resolution.

Summary

The error:

NET::ERR_CERT_AUTHORITY_INVALID

means that the browser cannot verify the SSL certificate presented by the website.

Common causes include:

• Self-signed certificates
• Expired certificates
• Missing intermediate certificates
• Certificate authority trust issues
• SSL/TLS configuration problems

If the website is hosted on mybox and the issue persists, contact support for assistance with certificate verification and configuration.