Yet (another) htacess problem

[eluser]JonoB[/eluser]
Thanks for the response

Adding a trailing slash to base_url (i.e. http://testing.mysite.com/) seems to work fine.

However, if I change the base_url to https://testing.mysite.com/ (without adding any ssl rewrites to htaccess), then I get a 404

I have also tried setting the base_url = '' - in this case http://testing.mysite.com works fine, and https://testing.mysite.com still gives a 404