If you are experiencing SSL issues with your Heroku app, there could be several reasons for the problem. Here are some common SSL-related issues on Heroku and their potential solutions:

  1. SSL Certificate Expired or Invalid: Ensure that your SSL certificate is valid and has not expired. If the SSL certificate is invalid or has expired, Heroku will not be able to establish a secure connection with your app. You may need to renew or replace the SSL certificate with a valid one.

  2. Incorrect SSL Certificate Installation: Double-check that the SSL certificate is installed correctly on your Heroku app. If the certificate is not installed properly, the SSL handshake will fail, causing SSL errors. Heroku provides documentation on how to add SSL to your app: https://devcenter.heroku.com/articles/ssl

  3. Mixed Content Issues: Make sure that all resources (images, scripts, stylesheets, etc.) on your website are being served over HTTPS. Mixed content (loading insecure resources over a secure connection) can trigger SSL errors in modern browsers.

  4. Custom Domains and DNS Settings: If you are using a custom domain, verify that the DNS settings are correctly configured to point to your Heroku app. Incorrect DNS settings can cause SSL handshake failures.

  5. Heroku SSL Endpoint: Ensure that you have the Heroku SSL Endpoint add-on installed and configured correctly. This add-on is required to serve SSL-secured traffic to your Heroku app. You can check if the SSL Endpoint is configured by running the following command:

    heroku addons | grep ssl
  6. Certificate Chain Issue: Check if the SSL certificate chain is complete and valid. Some SSL certificate providers require the installation of intermediate certificates along with the primary SSL certificate. If the certificate chain is incomplete or incorrect, it can cause SSL errors.

  7. Heroku Dyno Cycling: Heroku periodically cycles (restarts) dynos to maintain the overall health of the platform. This cycling can lead to temporary SSL connection issues. If the SSL errors are intermittent and go away after a few minutes, it might be due to dyno cycling.

  8. Update Heroku CLI and Libraries: Ensure that you are using the latest version of the Heroku CLI and related libraries. Outdated versions might have compatibility issues with the Heroku platform.

If you have tried these steps and are still encountering SSL issues with your Heroku app, it might be helpful to review Heroku's official documentation and consider reaching out to Heroku support for further assistance. Additionally, check the specific error messages you are receiving to gain more insight into the nature of the SSL issue.

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