In this post, I will try to help you to fix the problem that sometimes you can find when you hosted your site on shared hosting.
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Problem:
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.
Solution
Step 1:
Include the following line in the webconfig under <system.web>
<pages enableEventValidation="false" viewStateEncryptionMode="Never">
You can also include these things individually in every design page..
For example:
<%@ Page Language="C#" MasterPageFile="~/MasterHome.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" enableEventValidation="false" viewStateEncryptionMode="Never" Title="Untitled Page" %>
Step 2:
Now Include the following code inside <system.web> :
This is included in order to handle the error generated by the website in any case.. We have to include a .htm file which gets displayed whenever there is any error in the website…
Step 3: The last step is to include validation and decryption key in the machine key tag inside system.web :
This can done by generating these keys from the following website:
http://aspnetresources.com/tools/machineKey
Add the generated keys in system.web section of the webconfig:
Example:
<system.web>
<machineKey validationKey="AutoGenerate,IsolateApps"
decryptionKey="AutoGenerate,IsolateApps" validation="SHA1"/>
</system.web>