config session data for Ajax

[eluser]Ngulo[/eluser]
hi all ,

is there someone can tells me which configruation is using correctly for session using Ajax requests?

mine are as shown:

Code:

$config['sess_cookie_name']        = '*******';
$config['sess_expiration']        = 0;
$config['sess_encrypt_cookie']    = TRUE;
$config['sess_use_database']    = FALSE;
$config['sess_table_name']        = '********';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent']    = FALSE;
$config['sess_time_to_update']     = 30;

now ajax works good on my site but after n time sessions losts ....is there a perfect configuration can i use? )

thanks