Hi again
Thank you a lot it work
I make sommething strange but it is work!
on the server I do the command
usermod -aG shared www
it is put www dans le group shared I check it whith command
grep shared /etc/group
Merci jean-philippe
after that it is doesn't work? erreur 403 forbidden -- Permissions access denied in http log file

For solve the problem, to understand this morning on the "test server I have created a new ibay and put the hostname on this ibay... juste for to do some test if I can access to this ebay, same problem on this ibay no acces(error403), permissions denied , I delete the ibay on the test server .. and see the post for the user acces from Jean-philippe I make the operation and it is work! ok good I forgot this ibay creation and delete....
this evening on the prod server after correct the user permission and doesn't work I create a new ibay on the prod server and put the domain on this ibay and after this operation I can acces again to index.htm !!! ok good
I redo the let'sencrypt/SSL/dehydrated configuration and It is work! Strange but good new for my Week-end!

Thank you a lot
@Reept I try to understand the problem and I don't know what happend I check in admin email and I see the previously certificat renew is date to the last update to smeserver-letsencrypt-0.5-17.noarch you are already help me at this momnent.. (26novemeber2021) after I do anything whith this server.
If you want log or over information I can give you what you want

Thanks