Validation of viewstate MAC failed

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Hi,
I am getting the following error randomly on the website.Please provide me solution for this error.

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machinekey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Thanks,
Naveen Sharma

Posted 22-Jan-13 0:05am

Rohit from Delhi

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Sk. **Tajbir** · Answer 1 · 2013-01-22T00:31:00

Hi,
This can cause for DataKeyNames in your Control. Please Check this article. I think it will solve your problem and you'll get a clear idea.
http://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx[^]

After that go through these links as well:

I hope this will help.
Thanks :)