Below are steps to troubleshoot an inability to connect to a secure online payment gateway:

1. Check the website URL and settings to make sure it is properly configured and active for secure connections
2. Check that the browser is up-to-date and supports the payment gateway
3. Clear your browser’s cache and cookies
4. Disable browser extensions or plugins that could interfere with the secure connection
5. Make sure your Internet-connected devices have the latest security patches applied
6. Check your firewall settings to make sure they are not blocking the secure connection
7. Contact your network administrator or ISP for assistance if the issue persists