error web kampus 403 Forbidden dan 503 Service Unavailable mohon solusinya

Assalamualaikum Warahmatullahi Wabarakatuh...
 
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ index.php?/$1 [L]
 
kalau .htaccess di public_html seperti itu detail berita jadi 
 
503
Service Unavailable
The server is temporarily busy, try again later!
 
kalau .htaccess di public_html dibikin seperti dibawah ini.
 
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
#RewriteRule ^(.+)$ index.php?/$1 [L]
 
login administrator nya jadi 
 
403
Forbidden
Access to this resource on the server is denied!
 
mohon bantuanya masta :)