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.
服务器一弄负载均衡,都忘记加这个
<machineKey validation="3DES" validationKey="319B474B1D2B7A87C996B280450BB36506A95AEDF9B51211" decryptionKey="280450BB36319B474C996B506A95AEDF9B51211B1D2B7A87" decryption="3DES"/>

本文介绍了解决服务器负载均衡环境下 ViewState MAC 验证失败的问题。通过设置 machineKey 元素来确保验证密钥和算法一致,避免集群中因密钥自动生成导致的不一致问题。
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