关于nginx配置ssl，请教个问题

请教一下，为什么我在配置ssl的时候， 开启 ssl on;， 检测nginx配置就是fail,

具体配置如下

server {
        listen 443;
        server_name abc.cn www.abc.cn;

        root /var/www/community/public;
        index index.php index.html index.htm;

       ssl on;
        ssl_certificate /etc/nginx/ssl/1_abc.cn_bundle.crt;
        ssl_certificate_key /etc/nginx/ssl/abc_de.key;

        ssl_session_timeout 5m;

        ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers "HIGH:!aNULL:!MD5 or HIGH:!aNULL:!MD5:!3DES";
        ssl_prefer_server_ciphers on;

        location / {
                try_files $uri $uri/ /index.php?$query_string;
        }
        ...