Secure Your Connections: A Guide to Pinning SSL/TLS Certificates in Your Domain

Sugand singh
2 min readFeb 16, 2024


In the ever-evolving landscape of web security, ensuring the integrity and authenticity of your website is paramount. One effective method to achieve this is through SSL/TLS certificate pinning. This practice involves associating a specific SSL/TLS certificate with a particular domain, reducing the risk of man-in-the-middle attacks and enhancing the overall security of your web application.

In this guide, we will walk you through the process of obtaining SSL/TLS certificates from your domain and using a command to display the list of certificates associated with it.

Step 1: Understand SSL/TLS Certificate Pinning

SSL/TLS certificate pinning is a security mechanism that helps prevent attackers from using fraudulent certificates to impersonate your domain. By associating your domain with a specific set of certificates, you add an extra layer of security to your web connections.

Step 2: Obtain Certificates from Your Domain

Before implementing certificate pinning, you need to obtain the SSL/TLS certificates associated with your domain. This can be done using various methods, but one common approach is to leverage the OpenSSL tool.

Open your terminal and use the following command:

openssl s_client -connect

Replace “” with your actual domain. This command initiates an SSL/TLS connection to your domain and displays detailed information about the certificates in use.

Step 3: Analyze Certificate Information

Once you run the command, you’ll receive a wealth of information about the certificates associated with your domain. Look for the “subject” and “issuer” fields to identify the certificates.

Note: In a production environment, you may want to redirect the output to a file for easier analysis.

openssl s_client -connect > certificates_info.txt

Step 4: Pinning Certificates

After obtaining the certificate information, you can implement certificate pinning in your web application. This involves specifying the acceptable certificates and ensuring that only these certificates are trusted for secure connections.


SSL/TLS certificate pinning is a robust security measure that enhances the protection of your web applications. By understanding how to obtain and analyze certificates from your domain, you can confidently implement certificate pinning and fortify your website against potential security threats.

Remember to regularly update and monitor your pinned certificates to maintain the highest level of security for your online presence. Stay secure and stay informed!



Sugand singh

Experienced React Native dev, UI/UX expert, performance optimizer. Keeping up with mobile trends. Let's build mobile magic!