Session not work on server

[eluser]edidiway[/eluser]
sorry for the long time to me for posting to this thread.

@Cshamoh : I dont setting anything to the session in config.php file.
if you want see the setting from default, this is the code :
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_encrypt_cookie'] = FALSE;
$config['sess_use_database'] = FALSE;
$config['sess_table_name'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;

@narkboy : yes, on my mind just like yours, I think if the session works, it should works. but the fact, it didnt work. It only works on FF, but not the others.

if its because cookie / security, why when I ran on my localhost it worked fine.

and there is something I confuse :
I tell to some of my friends to run online using chrome browser on their computer, and it works.. hahaa..
why only on my computer didnt work on server but work on localhost. It seems very odds.
if its because my cookie, I think it is impossible thats my cookie setting on IE, Chrome, Safari, and Opera was crashed at the same time. but remember that the cookie works fine if I run on localhost.

thanks for anyhelp again.