View State Issue in WebFarm( MAC Failure)

We landed into one issue when we deployed the application in webfarm environment.

Reference

http://www.andreas-kraus.net/blog/index.php?s=postback
http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx -- the one which has 3 solutions
http://support.microsoft.com/kb/312906 - The one which really helped

http://aspnetresources.com/tools/keycreator.aspx (Key Creator Site)