IE8 and session problem

[eluser]Ajaxian64[/eluser]
My problem is far more important than described previously.
I set up the code on a real server (previously I was on localhost)

I can connect to my site with Chrome and Opera. But for IE and FireFox it seems there is a problem of session.

For real server I don't what to put on those following set up:

Code:

$config['cookie_prefix']    = "";
$config['cookie_domain']    = "";
$config['cookie_path']        = "/";

$config['cookie_prefix'] => No need (I hope)
$config['cookie_domain'] = 'mysite.com' Is it right ?
But entirely lost on $config['cookie_path'] = "/"; I really don't know how to set up this ...

Some help would be very appreciate ...