SSL Troubleshooting Resources for openssl s_client
How to include the whole certificate chain in your .cer, .crt or .pem certificate file?
What to do when you get "SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate in certificate chain)" - Help me! - Forest Admin Developers Community
tls - Problem in creating multi level certificate chain using OpenSSL - Super User
Troubleshoot SSL/HTTPS key generation
KB441533: How to Create a Trust Store with the Certificate Chain of SSL/TLS Secured MicroStrategy Components
Providing OpenSSL certificates for domains defined in HANA XSA | SAP Blogs
TechStump.com: How to Rearrange a Certificate Chain using OpenSSL