Config https in nginx

Hello, I tried to put grafana behind of nginx in secure mode. below is my nginx config file:
server {
listen 440;
ssl on;
server_tokens off;
ssl_certificate /ssl/nginx.crt;
ssl_certificate_key /ssl/nginx.key;
ssl_ciphers “ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256”;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 5m;
client_max_body_size 21m;
location / {
auth_basic “Restricted”;
auth_basic_user_file /htpasswd/pwdGrafana;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

and not any change in grafana.ini file.
when I tried _https:// _ I encountred {“message”:“Basic auth failed”} message in page