Articles on: SSL Certificates

Troubleshooting Common Let's Encrypt Issues

Troubleshooting Common Let's Encrypt Issues at dotCanada.com

Let's Encrypt is a free, open and automated certificate authority that provides SSL/TLS certificates. While it is a great service, users can sometimes run into issues when trying to obtain or renew certificates. Here are some common problems and solutions:

  1. Unable to Obtain Initial Certificate

• Make sure your domain's DNS is pointing to the correct server IP

• Check that ports 80 and 443 are open for inbound connections

• Verify that your server software is configured properly to use Let's Encrypt

  1. Certificate Renewal Failure

• Let's Encrypt requires the ability to perform HTTP validation on your domain

• Ensure that no firewall, proxy or content filter is blocking Let's Encrypt's validation request

• Check that the renewal process is automated and running without errors

  1. Rate Limiting

• Let's Encrypt limits the number of failed validation attempts to avoid abuse

• If you hit the rate limit, you may have to wait a week or two before retrying

• Use the --renew-by-default flag when running certbot to combine obtaining and renewing

  1. Expired Certificates

• Let's Encrypt certificates are valid for 90 days

• Set up a cron job or scheduled task to automatically renew 30 days before expiration

• Monitor renewal logs for any errors that need to be addressed

  1. Mixed Content Warnings

• This occurs when some resources on a page are loaded insecurely over HTTP

• Ensure all resources (CSS, JavaScript, images, etc.) are referenced with HTTPS links

• Use a tool like SSL Labs or WhyNoPadLock to identify mixed content

At dotCanada.com, we recommend using Let's Encrypt for secure SSL/TLS on your websites. Following best practices and monitoring the automated renewal process can help avoid most common issues.


Updated on: 08/05/2024

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