OCSP
From DWIKI
Links
HOWTO
Get the URL
openssl x509 -noout -text -in bundle.pem |grep -i ocsp # OCSP - URI:http://ocsp.sectigo.com
Verify
openssl ocsp -issuer foo.bundle -cert foo.crt -text -url http://ocsp.sectigo.com
==Responder Error: unauthorized (6)
Check bundle/chain and cert
