Certificat non reconnu - nginx

/etc/nginx/sites-available/default

server {
   listen 80;
   server_name mondomaine.com;
   return 301 https://$server_name$request_uri; #Redirection 
}

server {
   listen 443 ssl http2;
   server_name mondomaine.com;
   ssl_protocols TLSv1.2 TLSv1.1 TLSv1;
   ssl_certificate /etc/letsencrypt/live/mondomaine.com/fullchain.pem;
   ssl_certificate_key /etc/letsencrypt/live/mondomaine.com/privkey.pem;
   ssl_dhparam /etc/nginx/sites-available/dh.pem;
   ssl_ecdh_curve sect571r1:secp521r1:brainpoolP512r1:secp384r1;
   ssl_ciphers EECDH+AESGCM:EECDH+CHACHA20:EECDH+AES;
   ssl_prefer_server_ciphers on;
   ssl_trusted_certificate /etc/letsencrypt/live/mondomaine.com/chain.pem;
   ssl_stapling on;
   ssl_stapling_verify on;
}