If logined in with SSL, login not valid anymore for HTTP

I have a Domino server. I setup SSL on the HTTP task. If I login with HTTP, I can acces any other DB via HTTP without a problem but if I suddendly try to access the same DB via HTTPS, it tells me the session is expired.So basically the login seems to be only valid for the Web protocol used for the authentcation on the login page.

If I login with HTTPS and then try to access an HTTP DB, “boom”, session expired and I would only be able to access that HTTPS DB only if I autenticate with HTTPS.

Any idea of what could be happening ?

Thanks in advance