Title:	ASP.NET Viewstate error - Validation of viewstate MAC failed
Posted At:	12/9/2008
URL:	http://blogs.msdn.com/tess/archive/2008/03/17/asp-...

Last week I was working with on a case where they were getting this error message HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster

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