forms authentication cookie changes

From: Andy Fish (
Date: 07/21/05

Date: Thu, 21 Jul 2005 16:35:00 +0100

Hi all,

For reasons I would rather not go into, I sometimes need to get the value of
the forms authentication cookie and use it later when submitting another
request to the server.

mostly this works fine but sometimes it seems that the server decides to
change the forms authentication cookie (in contrast to the session cookie
which stays the same the whole time the session is in existence).

note that this is not happening because the authentication timeout has
expired. I am still logged on as the same user and have the same session;
it's just that the cookie value has changed.

Can anyone explain why and how this happens, and if there is any way I can
control (or disable) this behaviour?