Pages 404ing when on https:// - .htaccess

Question

I've just installed an SSL on my server and enabled https on my websites admin area however now when normal pages are accessed with https:// instead of http:// I get a 404 page. This is my htaccess, it has the standard expressionengine index.php removal in as well but I can't work out what I need to change to make https:// work if front-end pages are accessed with it, any ideas?:
<IfModule mod_rewrite.c>
RewriteEngine On
# force https for all URLs in /admin.php
RewriteCond %{HTTPS} =off
RewriteRule ^admin.php https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# Redirect index.php Requests
# ------------------------------
RewriteCond %{THE_REQUEST} ^GET.*index\.php [NC]
RewriteCond %{THE_REQUEST} !/system/.*
RewriteRule (.*?)index\.php/*(.*) /$1$2 [R=301,L]
# Standard ExpressionEngine Rewrite
# ------------------------------
RewriteCond $1 !\.(css|js|gif|jpe?g|png) [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]
</IfModule>

Answer 1

Replace all of your code with this:
RewriteEngine On
# force https for all URLs in /admin.php
RewriteCond %{HTTPS} off
RewriteRule ^admin\.php https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
RewriteCond %{REQUEST_URI} !/system/ [NC]
RewriteCond $1 !\.(css|js|gif|jpe?g|png) [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]