Thank you for your help.
But in my case, I have to use 2 servers because LE is not supported by my nas so.
My nas (syno) has a reverse proxy and redirects http requests on the port 9999 of my second server (ubuntu)
On this server, I execute LE with your paramaters.
But it doesn’t work and failed with :
“Failed authorization procedure. www.domaine.fr (http-01): connection :: The server could not connect to the client for DV :: Could not connect to http://www.domaine.fr/.well-known/acme-challenge/Ktk5ca5PLu7IZi2Uh4Duo1grTt9_0P8g406b7gTnx48”
