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following a problem with my forum, i had to do a complete reinstallation but server side everything is fine.
but I do not understand why I have nothing left in the folder / etc / letsencrypt / live /
on the other hand in the folder /etc/letsencrypt.backup/ there is apparently everything that should be in the folder / etc / letsencrypt /
I try to make a copy of the files in /etc/letsencrypt.backup/ to / etc / letsencrypt but it is unsuccessful.
as you may have seen it's actually not my first certificate and until now everything goes well.
I tried as usual with the command sudo and after a failure I tried with the user root.
I will try a method, give a permanent redirection HTTPS => HTTP so that my site is always accessible compared to the end of the certificate that ends tomorrow.
To completely uninstall the ssl certificate.
then do a clean installation of a new certificate.