Tools

• Certificate installation checker - This tool will provide details for an installed certificate
• https://comodosslstore.com/ssltools/ssl-checker.php/
• Qualys Detailed SSL/TLS Security Vulnerability and Configuration Analysis:
• https://www.ssllabs.com/ssltest/
• Best tool for visualizing SSL/TLS Certificate Chains: 
• https://www.immuniweb.com/ssl/
• SSL/TLS tool for testing and analyzing SSL/TLS certificates - This link includes multiple tools that users may find helpful whether it's decoding a CSR or generating a CSR
• https://www.ssltools.com/

Resources

• The Electronic Frontier Foundation SSL Observatory:
• The EFF SSL Observatory
• Unqualified Names in the SSL Observatory
• Sectigo Status Page: https://sectigo.status.io/