[百思不得其解] Nginx 连接已重置 ERR_CONNECTION_RESET

首先说明，域名确定没有被 Q ！
服务器只开放了 443 端口，Nginx 配置如下：

server {
        listen       443 ssl http2 fastopen=3 reuseport;
        server_name  abc.com;
        add_header   X-Frame-Options "DENY";
        add_header   Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";

        ssl_certificate      /usr/local/nginx/ssl/abc.pem;
        ssl_certificate_key  /usr/local/nginx/ssl/abc.key;
        ssl_dhparam          /etc/ssl/certs/dhparam.pem;
        ssl_session_cache    shared:SSL:5m;
        ssl_session_timeout  5m;
        ssl_protocols        TLSv1.2 TLSv1.3;
        ssl_early_data       on;
        ssl_prefer_server_ciphers  on;

        location / {
            root   html;
            aio    threads;
            index  index.php;
        }

        location ~ \.php$ {
            root           html;
            fastcgi_pass   unix:/usr/local/php/php-fpm.sock;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_param  HTTPS            $https;
            include        fastcgi_params;
        }
    }

访问 https://abc.com 总是连接已重置 ERR_CONNECTION_RESET，求大神指点迷津啊！！