Test your SSL’s configuration
You can use the (CSR decoder) to ensure you have the correct common name and organization listed in the certificate signing request(CSR) generated on your server.
If the CSR you are using is for a (wildcard certificate), the CSR must include the asterisk for the sub-domain level you wish to cover on the common name. Example: To secure test.coolexample.com and www.coolexample.com, the common name on your CSR needs to be *.coolexample.com
After you have( installed )your SSL certificate, you can use the (Certificate Checker) to view the details on your certificate, as well as check for a variety of common SSL issues.