viewstate MAC failed Error in website

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hi,

i hv developed a website but sometimes i got the following viewstate MAC failed error

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.

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.

Source Error:

[No relevant source lines]

Source File: App_Web_xb1xuhdw.6.cs Line: 0
pls tell me why it is and what i shud do to solve it

Thanks

Posted 12-Feb-12 20:22pm

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Shameel · Answer 1 · 2012-02-13T08:46:00

Are you using multiple servers that are load balanced? If yes, then there are two ways to handle this:

1. Set your Load balancer rule so that requests from a specific client always go to the same server (sticky sessions)
2. Set the same machine key on all the servers. (Search "ASP.NET machine key" in google to see how to do this)