i've done a ton of forum and google search, but i can't get SSO to work

I've installed OTRS with MSSQL and WS2008 based on the wiki (http://wiki.otterhub.org/index.php?titl ... _and_IIS_7) all is working well.
i've configured Config.pm as wiki (http://wiki.otterhub.org/index.php?titl ... for_agents) and all is working well too, i (Agent) could Log as a AD user via the login page.
BUT
I'm trying to get SSO working, since IIS and IE (even firefox) could handle ntlm / kerberos authentication.
I've followed info on http://wiki.otterhub.org/index.php?titl ... ith_Apache converting APACHE info into IIS ones (ie changing the way IIS authenticates users from anonymous to integrated).
IIS Logs display correct user handling (pages are served to <remote_user>), otrs.log doesn't display any error at all nor otrs.log.error.
All seem to work but it's not

i even dug into HTTPBasicAuth.pm changing line 70 from HTTP_REMOTE_USER with REMOTE_USER that's the name of IIS ServerVariable with the username with no luck ...

Is there a way i could enable some Verbose, extended log into OTRS or anyone have some clues ?
PS unfortunately searching for common topics like IIS or SSO is impossible in this forum since the threshold is set to <3 char ...
Thanks in advance for any help you could and would give
