ASP.NET MVC, IIS 7.5 - Losing Sessions Across Servers (Load Balanced)

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http://serverfault.com – We have a site running on 3 web nodes. We are using SQL Server session storage. We recently added two more only to find that users' sessions are lost when they are sent to one of those machines. We have checked the site ID as well as the machine validation key and decryption key. What might be causing this issue? (HowTos)