logging into imp

[Antoine Hayoz]

Hi

I have a little problem when trying to log into the imp 2.2.4. I've
installed horde/imp and I ran the test.php3. Everything was ok. Now I try to
log in and after having entered my username and my password I get This
message: "Either you have logged in incorrectly or your login has expired.
Please login again." And if I try to login again as proposed, I get the same
message.
I'm sure of my password and username.

I searched in the faq and the mailing list archive but I didn't find
anything.

Does anyone have an idea of where I have to look for?

Thanks for your help

Antoine