Validation of viewstate MAC failed

 

I got the following error on an ASP.Net application:

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.

 

However
does not solve the problem.
The fix can be simpler:
Add PostBackUrl=’#’ to the control causing the postback.

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