Installing SSL for codeigniter

Dear All,

I have just installed SSL for my site. and put following in htaccess for redirection.

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://example.com/$1 [R=301,L]

Now home page is working fine, but when i tried to open Admin Page or any other page it gives 404 error.

then i removed above code from htaccess and try open manually by writing **redacted**, then its working absolutely fine for all pages.

Please guide me accordingly.
Thanks