Thank your Richard for your answer.
I’m not sure to understand when you write “keep it as simple localhost”: I have “localhost”.
https://localhost display a page with all my local web sites are listed, as link.
mysite1.localhost
mysite2.localhost
…
.
The old one are working nice. Anyway, some are not working as I describe in my precedent post. And if I create a new website install, the result is the same as those are not working. (screenshot).
I tried to scratch everything and install again Ampps but no change…
May be I have a wrong conf file somewhere but I can’t understand where.