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Message: <blockquote data-quote="catsclaw227" data-source="post: 4540628" data-attributes="member: 14197">This is the sliding expiration on the session cookie. What that means is, when you log in, the server sets a cookie for your browser to view, called a session cookie.  It generally stores information about the site you are visiting, maybe your username, gives you a session ID and sets an expiration time for the cookie to expire, so that you are considered "logged out" after some idle time.  Each time you visit a new page, the server will send a small packet down to update the expiration of the cookie (generally set at 20min by default by Windows IIS servers).  Thus, as you visit pages the expiration "slides" to always keep you good for another 20 minutes.</blockquote>