OTRS and LDAP Auth

[Richie8410]

Hi all. I'm trying to set up a helpdesk system using OTRS. So far the set up has been simple. But I've got a problem. I've used a script in the config.pm file to get users from AD (2008R2) directory. I can see the users, I can log jobs against them, everything works. Except.... When I try to login to the customer portal it just says username or password incorrect. It isn't, I've reset it, I've tried everything. Anyone had this issue before? I'm using version OTRS 3.3.9 with Apache2 and MySql on a Linux debian box. Any help would be great, I'm on a deadline!