问题
I am currently receiving this error:
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.
I have found multiple solutions to this error. The solution we are currently using is to add a static MachineKey field at the machine level and to use static validation keys and decryption keys.
<MachineKey validationKey="" decryptionKey="" validation="SHA1" decruption="AES" />
Will this solution work for .NET 3.5? Is there a more elegant solution?
回答1:
Is your web app hosted in a webfarm?
If so, the reason for this is that a page is rendered by server 1, and posted to server 2. Therefore, machine keys are different, and the validation failed.
It will work on ASP.NET 3.5 as well.
来源：https://stackoverflow.com/questions/331720/validation-of-viewstate-mac-failed