Sure you are right.
But in fact, I hoped to have correctly installed my own CA.
I don't understand what you mean by "correctly installed my own CA".
Your CA is NOT trusted by browsers => any certificate signed by your CA will be considered as invalid.
You need a certificate signed by a commercial CA, which is trusted by your browser (or install the
certificate of your CA into "Trusted Root CA" in your browser).
Where so you find these messages ? what tool do you use to get them ? javascriot console ? under Firefox ?
Browser console (Safari, FF, Chrome).