Joined AD but users need to re-authenticate

Hi,

After some arguing with the ReadyNAS, I was finally able to get it to join the domain.  Under users and groups in the readyNAS I am able to see my AD users and groups.  But, it seems like those user accounts are now "local" to the nas. 

When a user logs in to a windows computer with their domain credentials they have to re-authenticate to the ReadyNAS share they want to access.  Windows by default will try their domain\username credentials that they are logged in as.  In order for me to get a share open I have to try to authenticate to the ReadyNAS without the domain\ in front of the username.  This makes for a problem when trying to mount user home directories or shares via login script since they are essentially two different accounts.