Multiple session entries

[eluser]tomcode[/eluser]
what I can see :

Code:

// may cause multiple sessions for one visitor if set to true
$config['sess_match_ip']               = TRUE;

// allow all sub domains (www !) by prefixing with a point, else may cause multiple sessions for one visitor, are Your addresses clean w / wo www ?
$config['cookie_domain']        = ".foodomain.com";