视图状态MAC的Asp.net验证失败
问题描述：
我收到的asp.net网站在某些时候下面的错误。
I am receiving the following error at certain times on asp.net website.
Sys.WebForms.PageRequestManagerServerErrorException:
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.
在页面刷新的推移，没有problem.How我能解决这个问题？
When page refresh goes,no problem.How can I solve this problem?
答
如果您使用的是Web场并运行在多台计算机相同的应用程序，你需要在machine.config文件中明确定义了计算机密钥：
If you're using a web farm and running the same application on multiple computers, you need to define the machine key explicitly in the machine.config file:
<machineKey validationKey="JFDSGOIEURTJKTREKOIRUWTKLRJTKUROIUFLKSIOSUGOIFDS..." decryptionKey="KAJDFOIAUOILKER534095U43098435H43OI5098479854" validation="SHA1" />
把它下的＆LT;的System.Web方式＆gt; 标签
有机器code中的自动生成，不能使用。生成自己的machineKey看到这个PowerShell脚本：
http://support.microsoft.com/kb/2915218#AppendixA
The AutoGenerate for the machine code can not be used. To generate your own machineKey see this powershell script: http://support.microsoft.com/kb/2915218#AppendixA