[otrs] Authentication of customers with radius?

Hi, I'm trying to authenticate our customers by using an existing radius server in our network. i have no clue what i´m doing wrong. I'm using: $Self->{'AuthModule'} = 'Kernel::System::Auth::Radius'; $Self->{'AuthModule::Radius::Host'} = 'myradius.company.com'; $Self->{'AuthModule::Radius::Password'} = 'somepass'; It seems like there's never any contact between otrs and the radiusserver. At the customer login page I get the following error: "Can't locate object method "new" via package "Kernel::System::Auth::Radius" at /opt/otrs//Kernel/System/CustomerAuth.pm line 82." Anyone have any experience from this? Any help would be great! :) Regards, Andreas