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....

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hello
i have hosted a website on my local system. but it throws following 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.

for that i made changes in web.config as follows

XML

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
      </assemblies>
    </compilation>
    <customErrors mode="Off"></customErrors>
    <authentication mode="None"></authentication>
    <pages enableEventValidation="false" viewStateEncryptionMode="Never" />
    <machineKey validation="SHA1" validationKey="A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1B2C3D4E5" decryption="Auto" decryptionKey="A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1" />
  </system.web>
  <connectionStrings>
    <add name="constr" connectionString="Data Source=RAJEEV-PC; Initial Catalog=Hindalco_muri; Integrated Security=True;"/>
  </connectionStrings>
</configuration>

still i m getting same error. please help me

Posted 26-Jun-14 2:25am

TAUSEEF KALDANE

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_Asif_ 26-Jun-14 8:31am

Are you running your application in a cluster/Webform?

TAUSEEF KALDANE 26-Jun-14 8:34am

how would i know about whether i m running application in cluster/Webform or not.

Philippe Mori 26-Jun-14 8:33am

From where come the validation and decryption keys?

Wombaticus 26-Jun-14 8:38am

This is a nightmare error, as it can have so many causes ... one rarely documented one is if you are using any kind of URL-rewriting ..

You may also want to try adding the following to your system.web section in config:
<pages renderAllHiddenFieldsAtTopOfForm="true" controlRenderingCompatibilityVersion="4.0"/>
<httpruntime requestvalidationmode="2.0"/></httpruntime/>

TAUSEEF KALDANE 27-Jun-14 1:03am

i tried this but getting same error plz help me

Wombaticus 27-Jun-14 4:57am

The first step is to find out which part of page/code is causing this. As I said, URL-rewriting is one possible cause, if you are using that. Or Server.Transfer, maybe? If not, are you dynamically changing any server controls? An example maybe some linked lists, so when the user selects something in one, the second changes accordingly?

If nothing else, try removing controls one by one until (hopefully) you find it works - once you know where the problem lies you can find a way to solve it. It's a bugger of a problem though, which can be very hard to track down and solve.

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Richard Deeming · Answer 1 · 2014-06-26T08:44:00

Turning off ViewState MAC is a very bad idea, and is no longer supported as of .NET 4.5.2:
http://blogs.msdn.com/b/webdev/archive/2014/05/07/asp-net-4-5-2-and-enableviewstatemac.aspx[^]

Microsoft have published a knowledgebase article which might help:
Resolving view state message authentication code (MAC) errors[^]