Nginx没有'；t使用certbot letsencrypt在https中工作

我已经执行了certbot web中显示的步骤，并且已经生成了证书。它们位于

/etc/letsencrypt/live/example.com/

中，这是我的

/etc/nginx/sites available/default

：

# Default server configuration
#
server {
listen 80 default_server;
#listen [::]:80 default_server;

root /var/www/html;

# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html;

# server_name _;
server_name example.com;

location / {
    # First attempt to serve request as file, then
    # as directory, then fall back to displaying a 404.
    try_files $uri $uri/ =404;
}

# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
#   deny all;
#}

listen 443 ssl; # managed by Certbot

ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;      # managed by Certbot
ssl_session_cache shared:le_nginx_SSL:1m; # managed by Certbot
ssl_session_timeout 1440m; # managed by Certbot

ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # managed by Certbot
ssl_prefer_server_ciphers on; # managed by Certbot

ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA ECDHE-ECDSA-AES256-SHA ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES256-SHA384 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-SHA ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-SHA DHE-RSA-AES256-SHA DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256 EDH-RSA-DES-CBC3-SHA"; # managed by Certbot

if ($scheme != "https") {
  return 301 https://$host$request_uri;
} # managed by Certbot

}

如果我进入example.com，它会很好地重定向到

问题是，它总是显示一个错误，表明显示页面时出错

DNS通过一个条目（例如.com）进行了良好的重定向

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PD:假设example.com是我的域

我忘了重定向路由器中的443端口