Validation of viewstate MAC failed / The state information is invalid for this page and might be corrupted

In My Application got an MAC validation Failles  Exception in some Situation.  Experts Can please tell me in which situation MAC validation Failles . and please tell me how to fix these MAC Problem

Even i have mention in the webconfiq file as " enable MAC validation = false "
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.
 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
Exception Details: System.Web.HttpException: 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.

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Murthy1Asked:
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abelConnect With a Mentor Commented:
the mac validation can be set to on for each page. This error is not easily resolved, but you can try checking what the settings are on the page that raises this error.

In this thread, I summarized a couple of behaviors of ViewState and EnableViewStateMac (link will bring you to correct comment).

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