Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey & validation algorithm. AutoGenerate cannot be used in a cluster.
Solution:
Disable viewstate change by adding this to the affected aspx page.
EnableViewState="false" EnableEventValidation="false" enableViewStateMac=false
For example:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="myLogin" EnableViewState="false" EnableEventValidation="false" enableViewStateMac=false %>
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