IIS 7.5 Web Farm With Loading Balance (Session Problem)

http://serverfault.com/questions/288981/load-balanced-iis-7-5-web-server-asp-net-session-state-problem


A:  open state server to store session (make sure all the farms can access state server via network connection)

B:  synchronize the machine key
http://technet.microsoft.com/en-us/library/cc755177%28WS.10%29.aspx

C:  share IIS configuration ( the Site ID must be equal )
http://www.iis.net/learn/manage/managing-your-configuration-settings/shared-configuration_264

 http://www.iis.net/learn/manage/managing-your-configuration-settings/configuring-a-web-farm-using-iis-shared-configuration