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i have these message in only one user of my web ASP.NET application.
Validation of viewstate MAC failed. If this application is hosted by a Web Farm
or cluster, ensure that <machineKey> configuration specifies the same validationKey &
validation algorithm. AutoGenerate cannot be used in a cluster.
Any idea how to fix these?
Here’s some information. However, you might want to try installing the .NET 3.5 SP1 before trying anything else, and see if that resolves the issue:
http://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx