Validation of viewstate MAC failed

Question

i used this line in web config for this error Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.  But Again same error is repeating after 2 days. Any one give suggestion

Rajeesh Menoth · Answer

Hi Please check the following reference : http://stackoverflow.com/questions/5647525/validation-of-viewstate-mac-failed http://stackoverflow.com/questions/19355196/viewstate-exception-validation-of-viewstate-mac-failed https://rajeeshmenoth.wordpress.com/2014/05/20/validation-of-viewstate-mac-failed-in-asp-net/