连接超时，当我添加ssl

我正在尝试使用本教程将ssl添加到我的网站（ https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-14-04 ）。 浏览器被redirect到https://www.example.com，但后来超时。 我在这里看过类似的问题，没有运气。 有什么我失踪？ 请看下面的我的nginxconfiguration（实际域名删除）：

server { listen 80; server_name example.com www.example.com; return 301 https://www.example.com$request_uri; } server { listen 443; ssl on; root /var/www/example/public; index index.php index.html index.htm; server_name www.example.com; ssl_certificate /etc/letsencrypt/live/www.example.com/fullchain.pem; ssl_certificate_key /etc/letsencrypt/live/www.example.com/privkey.pem; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_prefer_server_ciphers on; ssl_dhparam /etc/ssl/certs/dhparam.pem; ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA'; ssl_session_timeout 1d; ssl_session_cache shared:SSL:50m; ssl_stapling on; ssl_stapling_verify on; add_header Strict-Transport-Security max-age=15768000; location / { try_files $uri $uri/ /index.php?$query_string; } location /blog/ { try_files $uri $uri/ /blog/index.php?$query_string; } location ~ \.php$ { try_files $uri /index.php =404; fastcgi_split_path_info ^(.+\.php)(/.+)$; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } } 

 listen 443 ssl; 

 listen 443 ssl http2; 

 # sudo service nginx restart 

 # sudo service nginx status