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...

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hi,
this is which type of error.

VB

Server Error in '/' 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 and validation algorithm. AutoGenerate cannot be used in a cluster

please help.

Thanks

Posted 22-May-12 23:03pm

GV Sharma

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Sandeep Mewara 23-May-12 5:30am

When are you getting this? What are you trying to do on your webpage when you get it? Datagrid data bind? What feature?

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to.areeb · Answer 1 · 2012-05-23T00:52:00

SQL

The reason for this error is validation of Viewstate failing because of different value of key for encryption/decryption across different server on farm. Below link provide good explanation of this error and possible resolution for the same.

Add these lines in web.config

XML

<system.web>
<pages enableViewStateMac="false" />
</system.web>

OR
Add Machine key on web.cofing
sample machine key

<machinekey>
validationKey="9B648362BE0A4C3FEDD4D9C97F148CA71497C5128BF543DDB37D70AEFBA2F16D184A900A
C1C16331F5E95708BAD6A67286B74CEBBE4ACDEA58B787AF1BD7BFE4"
decryptionKey="86D46880FD9C2F391D9176A24EF22A16560AD69B7AE37146"
validation="SHA1" />

You need to add this to encrypt the ViewState information is a WebFarm
Reference:http://msdn.microsoft.com/en-us/library/ms998288.aspx
Please read the above reference from MSDN you will come to know clearly