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How to Fix Comodo RSA Certificate Not Trusted Error

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Here’s a Simple Fix to Solve Comodo RSA Certificate Not Trusted

If you’re visiting the website and you get an error message on your browser saying, “Comodo RSA Certification Authority Not Trusted,” or “Comodo RSA Certificate Not Trusted,” it merely means that whichever browser you’re using doesn’t have the trusted Comodo root certificate installed in its trust store. This error message is not commonly seen, but it’s witnessed on some of the occasions. Fortunately, a simple fix is available for this error message.

What is Comodo RSA Certification Authority?

In case if you’re not aware and trying to find out what’s Comodo RSA Certificate: It’s Comodo’s issuing root. It means it’s used for signing and chaining other SSL/TLS certificates that are issued for the websites.
root-certificate-information

Here’s Why the Comodo RSA Certification Authority Not Trusted Error Occurs

All the browsers have one thing common called a trust store or a root store, which is used for authenticating SSL/TLS certificates of the trusted Certificate Authorities. This trust store or a root store contains all the roots of the Certificate Authorities, which is trusted by the browsers for issuing SSL/TLS certificates. Nevertheless, all the popular browser providers like Google, Mozilla, Apple have their own trust store programs, which regularly audit Certificate Authorities (CAs) for ensuring compliance to protect the whole system.

One of the examples is the Mozilla Project, which is used by the Thunderbird email client and Firefox. Here, Mozilla accepts certificates of the trusted certificate authorities, which meets all the requirements of the program’s policy. Moreover, it also has an authority to remove any CA if it doesn’t meet their criteria. So, whenever your browser comes across any HTTPS enabled website, it’ll check for the chained SSL/TLS Certificate back to its root certificate, which is in the root store, which validates the legitimacy of the SSL/TLS certificate.

Coming back to our error message, “Comodo RSA Certification Authority Not Trusted,” it simply means that your installed browser fails to link the SSL/TLS Certificate of that website back to its root store. Mostly, this error could be resulted due to the user’s mistake, i.e., an unintentional deletion of the certificate from the browser’s root store.

Here’s the Method to Fix Comodo RSA Certificate Not Trusted Error

To solve the Comodo RSA Certificate Not Trusted error message, there are two different methods. First, find out which root has been unintentionally deleted by you and to reinstall. Secondly, delete your presently installed browser and reinstall it again.

Let’s explore each of these methods in detail.

Adding Deleted or Missing Comodo Root Into Your Web Browser

  • Firstly, visit the website from which you’re getting this error. Once the website loads, click on the Padlock located in the address bar.
  • It will open Connection is a secure popup, from that click on View Certificate Details option, and locate the certification path.
  • In that certification path, you’ll find a list of certificates in which your root certificate is located at the top.
  • Go to Comodo’s Helpdesk and download the missing root.
  • Now, go to the HTTPS section of your browser and import your downloaded root certificate.

Deleting & Reinstalling Your Web Browser

I don’t think it needs much explanation. But it’s recommended that before you delete your browser, make the backup of your saved passwords and other important data, bookmarks, etc. And, once it’s done, download and install the latest web browser.

Wrapping Up

Put simply, it means that the Root Certificate is not installed properly, or it has been deleted unintentionally. Because, this error message “Comodo RSA Certificate Not Trusted,” or “Comodo RSA Certification Authority Not Trusted,” is not something that occurs regularly. Moreover, if you come across this error message, it’s recommended to check all the three certificates that are visible by clicking on View Certificates option on the Padlock in the browsers address bar.

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