posting is possible only from the pc used for registering?

[shutt1e]

hello, i can post messages to this board but only from the pc that i have used for register myself on the forum.
if i login from another pc it accept my login/pass but when i post it popups the login/pass requester again that says no forum thread is selected. this happens on both reply or start new thread
of course,the ip of the other pc is different from that of the registerd pc.
any solution?

[mpucoder]

Turn on cookies.

[shutt1e]

if you can read this, now it's ok
default ie6 sp1 cookie setting is automatic cookie manager
i have changed the automatic to manual allowing cookie session accepting.

tools menu/internet options/privacy/advanced

EDIT-----------
ok,it works!!!

thanks