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Understanding and Fixing Google Chrome's ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN Errors

When it comes to web browsing, Google Chrome is a popular choice for many users. However, even the best web browsers aren't perfect, and errors can occur from time to time. One such error that you might encounter is the ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN error. So what does this error mean, and how can you fix it?

Explaining the Error

The ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN error occurs when Google Chrome tries to establish a secure connection to a website but the SSL certificate presented by the website's server does not include the necessary information to verify the website's identity. This can happen for a few different reasons, and can prevent you from accessing the website you're trying to visit.

Understanding SSL Certificates

To understand why the ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN error occurs, you'll need to know a bit about SSL certificates. SSL certificates are used to encrypt data that is transmitted between a website's server and a user's web browser. This helps keep sensitive information, such as login credentials and credit card numbers, safe from being intercepted by malicious third parties.

Each SSL certificate includes a public key that is used to encrypt data, and a private key that is used to decrypt it. The SSL certificate also includes information about the website's domain name and the organization that owns it. When you visit a website that uses SSL encryption, your web browser checks the SSL certificate presented by the website's server to verify that the website is legitimate and that the SSL certificate is valid.


There are a few different reasons why you might encounter the ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN error:

The SSL certificate presented by the website is expired or invalid.The SSL certificate does not include the necessary information to verify the website's identity.Your web browser is outdated or has a bug that prevents it from properly verifying SSL certificates.

Fixing the Error

If you encounter the ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN error, there are a few things you can try to fix it:

Clear your web browser's cache and cookies.Update your web browser to the latest version.Disable any browser extensions that might be interfering with SSL verification.If the error occurs on a specific website, contact the website's administrator to let them know about the problem.

If none of these solutions work, it's possible that the website's SSL certificate is invalid or that you're being targeted by a man-in-the-middle attack. In either case, it's best to avoid visiting the website until the issue has been resolved.


The ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN error can be frustrating to encounter, but it's usually fixable by taking a few simple steps. By understanding how SSL certificates work and what causes this error to occur, you can troubleshoot the issue and get back to browsing the web safely and securely.

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