System.Web.HttpException: Validation of viewstate MAC failed.

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Hi,

I m developing web application in asp.net
I m facing problem from last two days. while i have some changes in web.config file.

I have got the following error:
System.Web.HttpException: Validation of viewstate MAC failed.

full discription:
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.

I did search on internet, but I am not getting the solution.

Can anyone help me please

thanks in advance.

Posted 27-Mar-11 23:46pm

jeet786

Updated 27-Mar-11 23:53pm

Sandeep Mewara

v2

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Wild-Programmer · Answer 1 · 2011-03-27T23:51:00

Solution 1

Set enableEventValidation to false and viewStateEncryptionMode to Never as follows:

HTML

<pages enableeventvalidation="false"
    viewstateencryptionmode="Never">

Did you try the MSDN article @ http://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx[^]

Posted 27-Mar-11 23:51pm

Wild-Programmer