Validation of viewstate MAC failed machinekey生成、使用方法

前段时间公司为了减轻服务器压力，对网页做了集群，分布在多台服务器，通过DNS轮回解析到各台服务器，结果页面只要打开停留到DNS解析到下一个地址，就会出现出下错误信息。

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:

The source code that generated this unhandled exception

can only be shown when compiled in debug mode. To enable this, please

follow one of the below steps, then request the URL:
1. Add a "Debug=true" directive at the top of the file that generated the error. Example:
<%@ Page Language="C#" Debug="true" %>
or:
2) Add the following section to the configuration file of your application:
<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>
Note

 that this second technique will cause all files within a given

application to be compiled in debug mode. The first technique will cause

 only that particular file to be compiled in debug mode.
Important:

 Running applications in debug mode does incur a memory/performance

overhead. You should make sure that an application has debugging

disabled before deploying into production scenario.

Stack Trace:

[HttpException (0x80004005): Unable to validate data.]

   System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +294

   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +203

[ViewStateException: Invalid viewstate.

	Client IP: 218.28.26.86

	Port: 45262

	User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; FDM)

	ViewState: 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...]

[HttpException (0x80004005): 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.]

   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +267

   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +282

   System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4

   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37

   System.Web.UI.HiddenFieldPageStatePersister.Load() +198

   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +83

   System.Web.UI.Page.LoadAllState() +35

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7350

   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +213

   System.Web.UI.Page.ProcessRequest() +86

   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +18

   System.Web.UI.Page.ProcessRequest(HttpContext context) +49

   ASP.admin_articleadd_aspx.ProcessRequest(HttpContext context) +4

   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358

   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64