Last Updated on December 17, 2023 by Vikash Ekka
Securing your website with SSL encryption is vital for protecting user data. When your EC2 instance is in a private subnet behind an Application Load Balancer (ALB), checking the SSL certificate is slightly different.
In this guide, we’ll walk you through the simple steps to do just that.
Step 1: Access Your EC2 Instance
- Open a Terminal or Command Prompt:Begin by opening a terminal or command prompt on your computer.
- Connect to Your EC2 Instance:Use the SSH command to connect to your EC2 instance. Replace
your-key.pemwith your private key file and
your-ec2-private-ipwith the private IP address of your instance:
ssh -i your-key.pem ec2-user@your-ec2-private-ip
Make sure to replace the placeholders with the actual file path and IP address.
Step 2: Verify the SSL Certificate
- Run OpenSSL Command:Once connected to your EC2 instance, enter this command to get SSL certificate details:
openssl s_client -connect localhost:443 | openssl x509 -noout -text
This command connects to your instance on port 443 (HTTPS), retrieves the SSL certificate, and provides detailed information about it.
Step 3: Understanding the Certificate Information
The output provides various details about the SSL certificate:
- Version: Shows the certificate’s version.
- Serial Number: A unique ID for the certificate.
- Signature Algorithm: The method used for signing.
- Issuer Information: Details about the certificate issuer.
- Validity Period: Dates when the certificate is valid.
- Subject Information: Details about the certificate owner.
- Public Key Information: Info about the encryption key.
- Certificate Extensions: Additional features of the certificate.
- Regularly Update Certificates: Keep SSL certificates up-to-date to maintain security.
- Use AWS Certificate Manager: For a seamless experience, consider AWS Certificate Manager for managing SSL certificates.
- Monitor Expiry Dates: Set reminders to renew certificates before they expire.
Verifying the SSL certificate of an EC2 instance in a private subnet behind an ALB is crucial for ensuring a secure website. By following these simple steps, you’re well on your way to providing a safe browsing experience for your users.
Remember, SSL certificates build trust with your audience. Regular maintenance and updates are key to a secure online environment. By taking these steps, you’re not only securing data but also building credibility for your website.