Troubleshooting PayPal SSL Errors After Certificate Renewal in PrestaShop

PayPal SSL Errors After PrestaShop Certificate Renewal: A Troubleshooting Guide

A PrestaShop merchant, Selma, encountered an issue with the PayPal module after renewing their SSL certificate. While the webshop itself displayed a valid SSL certificate, the PayPal module reported an SSL error, preventing webhooks from being enabled. The error message indicated potential problems such as:

• htpasswd enabled
• HTTPS protocol not supported
• Wrong HTTPS certificate
• Invalid server settings or insufficient access rights
• getaddrinfo() thread failed to start

The merchant reported that the connection was established, but the module couldn't access the page.

Troubleshooting Steps and Solutions

A reply from wepresta provided several potential causes and solutions:

• Incomplete Certificate Chain: PayPal is stricter than browsers and may require the complete certificate chain, including intermediate certificates. Ensure the CA bundle is correctly installed. This is a common cause after certificate renewal.
• htpasswd Protection: Verify that the webhook URL is publicly accessible and not protected by htpasswd or other access restrictions. PayPal needs to access the URL without authentication.
• TLS Configuration: Ensure that the server supports at least TLS 1.2. Older TLS versions may be rejected by PayPal.
• DNS or Server Issues: The getaddrinfo() error suggests a potential DNS or server problem. Investigate server logs for related errors.

Actionable Steps

To resolve the PayPal SSL error after certificate renewal, follow these steps:

1. Verify the CA Bundle: Ensure that the correct CA bundle is installed on the server. Contact your SSL certificate provider for the correct bundle.
2. Check htpasswd Protection: Temporarily disable htpasswd protection on the webhook URL to see if it resolves the issue. If it does, reconfigure htpasswd to allow PayPal's IP addresses.
3. Review TLS Configuration: Check your server's TLS configuration and ensure that TLS 1.2 or higher is enabled.
4. Investigate DNS and Server Issues: Check server logs for DNS resolution errors or other server-related problems.
5. Contact Support: If the problem persists, contact your hosting provider or PayPal support for further assistance.

By systematically checking these potential causes, PrestaShop merchants can effectively troubleshoot and resolve PayPal SSL errors after renewing their SSL certificates, ensuring seamless payment processing.