Every AccountCentral .aspx page has a "security" control, this can be used to require the user to be logged in to load the webpage, on a page by page level.
ex: <xct:security id="security" runat="server" allowGuest="false" />

In that control there is a "allowGuest" property. (true/false)
--If the property is set to "true" the page will automatically redirect to the login screen.  Once logged in the user should be redirected back to the original page. 
--If the property is set to "false" the page will ignore user log-in status.