By tag: MachineKey
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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 ...
"There are many times when it is worthwhile to create a custom machineKey for your web.config file. This is worthwhile on a webfarm but also worthwhile on a stand-alone server so that your machineKey remains the same after an iisreset or application pool recycle. "