Why Comodo SSL fail sometime?

Any type of SSL certificates, including the Comodo SSL certificates that have been described above can have problems or failures at different rates for different reasons. Here are some common reasons why Comodo SSL certificates may fail or encounter problems: Here are some common reasons why Comodo SSL certificates may fail or encounter problems:

  1. Misconfiguration

Mismatch of parameters while installation and configuration of the SSL certificate on the server escalates the failures. Such mistakes could range from problems associated with the certificate chain such as mumbo-jumbo in the naming and sequencing of intermediate certificates, or mistakes in server settings. It usually leads to browsers invoking security related messages or errors when the users attempt to visit the site.

  1. Expired Certificates

They are valid for a specific duration of time which may between one year to three years depending on the SSL certificate. In the event the Comodo SSL certificate reaches its expiry date and is unchanged by a replacement within the due time, the website will not be deemed secure. The audience might be met with the warning or error message that the certificate has expired and this is a discouragement to the audience from gaining access to the site.

  1. Revoked Certificates

Comodo issues SSL certificates and depending on the nature of security threats, such certificates may be revoked for various reasons such as change of ownership. These expired or revoked certificates are not trusted by browsers, and result in various warnings every time the user attempts to access such a website. Some of the cases for revocation could be: If the keys become highly compromised, if the certificate was fraudulently procured, or if there is a legal challenge.

  1. Compatibility Issues

Another important factor that should be noted when using the Comodo SSL is occasional compatibility with new versions of web browsers, new operating systems or SSL/TLS versions. Older encodings may not be recognizable by browsers and devices, meaning that connections can be refused and older security measures can put out security warnings.

  1. Security Vulnerabilities

As with any protocols and software, security flaws can be found at one time or another either in the SSL certificates, or the encryption algorithms used by Comodo. They could pose significant risk to the confidentiality of encrypted communication, data integrity and confidentiality.

  1. Server and Network Issues

The HTTPS connection or web server which contains the SSL certificate may also be problematic or a network issue affecting the SSL certificate may occur. Temporary issues, which result from server down time, network outages, or alteration to server configurations that deal with HTTPS traffic are some common causes of SSL certificates failure.


Even the Certificate Authority as Comodo (now Sectigo) guaranteed for its SSL certificates, one can have troubles because of misconfigurations, expiration and revocation, compatibility problems, security concerns, server/network issues, or a brand change. These problems can be avoided, and your SSL certificate will work efficiently to protect the website’s traffic and retain the users’ confidence by performing some tasks: 

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