Here's a brief summary of the issues we know about the installation of an SSL certificate.
If you are getting the following error message "Missing intermediate certificate" please check your domain with whatsmychaincert.com and download the correct chain file
For any other kind of error, it's advised to run an in-depth analysis of your server setup.
This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet.
👉 SSL Labs