错误描述
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.
解决办法：
配置文件中 <pages enableEventValidation="false" viewStateEncryptionMode="Never" validateRequest="false" enableViewStateMac="false"/>
