Using SSL for entire website on Arcustech server
This worked for me on the Arcustech server:

Put this code in the root .htaccess file:

&lt;IfModule mod_rewrite.c&gt;
RewriteEngine On

# Send would-be 404 requests to Craft
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/(favicon\.ico|apple-touch-icon.*\.png)$ [NC]
RewriteRule (.+) index.php?p=$1 [QSA,L]

# SSL only
RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !^https
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} 




As RitterKnight mentioned you also need to modify your site's "Site URL" in Settings&gt;General to be https://.