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ASP.NET error: Validation of viewstate MAC failed.

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7.6
I have a web application that developed in ASP.NET 2.0, Telerik 2006 (AJAX library). In some cases when users execute website, they get the following error:

----------
Validation of viewstate MAC failed. If this application is hosted by a
Web Farm or cluster, ensure that <machineKeyconfiguration specifies
the same validationKey and validation algorithm. AutoGenerate cannot
be used in a cluster.
----------
I found that this error appear more frequently when users do not use my web application continuely. For  example, user execute some funtions again after do nothing for a long time (30 minutes to some hours).

Please give some advices.
Thanks so much.
Attachments:
 
Validation of ViewState MAC Failed
Validation of ViewState MAC Failed
 
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Expert Comment by naspinski:

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