Validation of viewstate MAC failed on 1st Time in Login Page.I have using ASP .Net C# application. In Login Page for 1st time this issue arises and after refresh the page the error is goes out. The error get on browser Console.
I googling on that and already added the MAC Key in web config but no result found.
The Below Issue Found :
"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".