プレビュー部分でパスが合わないのが罠でしょうか
server { listen 80; server_name {server_name}; root /var/www/vhosts/fc2blog/public; index index.php index.html index.htm; location / { try_files $uri $uri/ /index.php?$args; } location /admin { try_files $uri $uri/ /admin/index.php?$args; } location ~ \.php$ { try_files $uri $uri/ /index.php?$args; fastcgi_pass phpfpm; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } }