[otrs] Kerberos and LDAP Authentication

Hi all, our company network offers Domain (Kerberos) and LDAP authentification. Since the beginning of the OTRS project, we've been using LDAP Auth, but people in Domain would like to enable Kerberos Auth in OTRS. I've succesfully enabled Kerberos in Apache and AuthModule = 'Kernel::System::Auth::HTTPBasicAuth', but now people not in domain are not able to login. I've tried with 2 AuthModules ($Self->{AuthModule1} = 'Kernel::System::Auth::HTTPBasicAuth' and $Self->{AuthModule2} = 'Kernel::System::Auth::LDAP'), but OTRS never gets to the LDAP Auth Has anyone tried such a configuration? Anyone has a hint? Kind regards, Juan Clavero