HTTPS automatic redirect with .htaccess

[hydronix]

Cats were sleeping with dogs, the Sun has risen in the West. Editing Login, Core and Vbulletin URLS to https fixed the problem though.

[hydronix]

Edited the .htaccess file with

RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

All hell broke lose. How to ensure things work fine after...