How to configure when putting CodeIgniter into existing site

[eluser]Otemu[/eluser]
HI,

Test without htaccess to narrow down the problem, remove htaccess from http://www.mysites.com/site1/CI/

Then try to navigate to a page that you know exists in your codeigniter site example:
http://www.mysites.com/site1/CI/index.php/home

If it works then you know it issue with your htaccess, if it doesn't then you know some other issue within codeigniter, let us know your results