http://blogs.msdn.com/craeblog/archive/2006/07/20/673095.aspxA couple of years ago I was showing a customer how to configure ASP.NET for use in a web farm. Part of the procedure requires you to adjust the <machinekey> element in each server to the same settings, so that the ASP.NET encryption logic is usingen-USCommunityServer 2.1 SP1 (Build: 61025.2)