У меня есть следующий .htaccess
<IfModule mod_rewrite.c>
AcceptPathInfo On
RewriteEngine On
### Canonicalize codeigniter URLs
# If your default controller is something other than
# "welcome" you should probably change this
# RewriteRule ^(welcome(/index)?|index(\.php)?)/?$ / [L,R=301]
# RewriteRule ^(.*)/index/?$ $1 [L,R=301]
# Removes trailing slashes (prevents SEO duplicate content issues)
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)/$ $1 [L,R=301]
# Removes access to the system folder by users.
# Additionally this will allow you to create a System.php controller,
# previously this would not have been possible.
# 'system' can be replaced if you have renamed your system folder.
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /index.php?/$1 [L]
# Checks to see if the user is attempting to access a valid file,
# such as an image or css document, if this isn't true it sends the
# request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
# Without mod_rewrite, route 404's to the front controller
ErrorDocument 404 /index.php
</IfModule>
Также, пожалуйста, убедитесь, что директива AllowOverride вашего httpd.conf не установлена в None, так как это предотвратит чтение ваших правил .htaccess.