Merci pour la rapidité !
ci-après la réponse de la commande :
nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled)
Active: failed (Result: exit-code) since Sat 2016-12-03 11:30:35 CET; 8s ago
Docs: man:nginx(8)
Process: 14722 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=0/SUCCESS)
Process: 9607 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Process: 25743 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)
Main PID: 9608 (code=exited, status=0/SUCCESS)
Dec 03 11:30:35 ks355.kimsufi.com nginx[25743]: nginx: [emerg] a duplicate listen 0.0.0.0:443 in /etc/ngin...nf:9
Dec 03 11:30:35 ks355.kimsufi.com nginx[25743]: nginx: configuration file /etc/nginx/nginx.conf test failed
Dec 03 11:30:35 ks355.kimsufi.com systemd[1]: nginx.service: control process exited, code=exited status=1
Dec 03 11:30:35 ks355.kimsufi.com systemd[1]: Failed to start A high performance web server and a reverse ...ver.
Dec 03 11:30:35 ks355.kimsufi.com systemd[1]: Unit nginx.service entered failed state.
Hint: Some lines were ellipsized, use -l to show in full.