Hi, don?t know if Jakob is already on the list. He had a mailing last year http://lists.otrs.org/pipermail/dev/2008-June/001975.html and I am trying to realize this solution. I have a working kerberized environment based on MIT with Linux, AD and Apache but this is not working with OTRS. I assume there is any failure based on the user mapping and/or replace function, maybe anyone can point me to the right direction. /Message: Need UserLogin or UserID! Traceback (2751): Module: Kernel::System::User::UserLookup (v1.93) Line: 652 Module: Kernel::System::Auth::Auth (v1.41) Line: 215 Module: Kernel::System::Web::InterfaceAgent::Run (v1.43) Line: 192 Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::handler (unknown version) Line: 48 Module: (eval) (v1.88) Line: 203 Module: ModPerl::RegistryCooker::run (v1.88) Line: 203 Module: ModPerl::RegistryCooker::default_handler (v1.88) Line: 169 Module: ModPerl::Registry::handler (v1.99) Line: 31/ regards Christoph Ohliger