Session valid for http://www.domain.com but not for http://domain.com

[eluser]pistolPete[/eluser]

Code:

/*
|--------------------------------------------------------------------------
| Cookie Related Variables
|--------------------------------------------------------------------------
|
| 'cookie_prefix' = Set a prefix if you need to avoid collisions
| 'cookie_domain' = Set to .your-domain.com for site-wide cookies
| 'cookie_path'   =  Typically will be a forward slash
|
*/
$config['cookie_domain']    = '.domain.com';