[horde] Horde dual authentication problem

[Abuthiab Motaz]

Hello
I've installed a fresh horde 3.0.4 and IMP (Last release)
and I wanted to let IMP to handle all the authentication
but when I do this. I get problem to login
after I write the correct user and pass imp redirect me to nothing ! sometime gives me tow frames but with 404 error
I use uw-imap 

Any help will be grate 

thanks