Can't save user details when using RemoteUserMiddleware and Active Directory

[honyczek]

Hi,

when you use RemoteUserMiddleware (and RemoteUserBackend) for
authentication of users and authenticates against Active Directory
(mod_auth_sspi on Apache or Directory security on IIS), user's name
value is in format domain\username. It works good until you want to
set some details in Django Admin. If you try to save changes of user's
profile, it can't be saved because error "This value may contain only
letters, numbers and @/./+/-/_ characters." is displayed.

Should be disallowed backslash in username or not, if it works? Or are
there any recommendations about using Remote User from Active
Directory?

The Single sign-on authentication against Active Directory is very
important (I hope not only) for me, so it would be great if it should
work smoothly.

Thanks.

Jan