Ubuntu 上面 Nginx 配置了 https，死活无法访问，不知道啥问题

root@VM-0-10-ubuntu:/etc/nginx/conf.d# uname -a
Linux VM-0-10-ubuntu 4.15.0-118-generic #119-Ubuntu SMP Tue Sep 8 12:30:01 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
root@VM-0-10-ubuntu:/etc/nginx/conf.d# pwd
/etc/nginx/conf.d
root@VM-0-10-ubuntu:/etc/nginx/conf.d# cat default.conf 
server {
    listen 443 ssl;
    server_name  www.site.top;

    ssl_session_cache   shared:SSL:10m;
    ssl_session_timeout 10m;
 
    ssl_certificate  /book/swb/site.top_bundle.crt;
    ssl_certificate_key  /book/swb/site.top.key;
    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm; 
    }

}

nginx 信息

root@VM-0-10-ubuntu:/etc/nginx/conf.d# service nginx status
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/nginx.service.d
           └─override.conf
   Active: active (running) since Sun 2021-07-18 10:24:26 CST; 2min 50s ago
     Docs: man:nginx(8)
  Process: 14799 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=0/SUCCESS)
  Process: 14826 ExecStartPost=/bin/sleep 0.1 (code=exited, status=0/SUCCESS)
  Process: 14811 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
  Process: 14800 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
 Main PID: 14813 (nginx)
    Tasks: 3 (limit: 4464)
   CGroup: /system.slice/nginx.service
           ├─14813 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
           ├─14827 nginx: worker process
           └─14828 nginx: worker process

Jul 18 10:24:26 VM-0-10-ubuntu systemd[1]: Starting A high performance web server and a reverse proxy server...
Jul 18 10:24:26 VM-0-10-ubuntu systemd[1]: Started A high performance web server and a reverse proxy server.