can't login with internet explorer

[ido]

I've just installed a demo server and the strangest thing : i cannot login into the web client using internet explorer 7. we tried several computers, with no success. the login screen keeps appearing after we enter our username/password.
firefox works well !
are we missing something ?
Thanks

[Beth]

Do you have an underscore in the machine name? Cookies don't like that.

[ido]

actually I did have an underscore !
that also explains why it work on //localhost and not //vm_fortress on the same machine.
and I thought my applications are difficult
thanks

[Beth]

Thanks for the update.