How do I fix "validation of viewstate MAC failed." problem?

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Dear Sir,

I have hosted an ASP.Net website developed in Framework 4.0. As I try working with them they are throwing error like:

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.

Sometimes ago this problem was not coming while hosting such websites.

Can you please help me out to fix this problem.

Thanks

What I have tried:

I have tried adding the following code in Web.Config file but no use.

<pages enableViewStateMac="true"/>

Posted 19-Oct-19 1:49am

Indrojeet_Bhattacharya

Updated 19-Oct-19 22:07pm

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RickZeeland · Answer 1 · 2019-10-19T22:07:00

Solution 1

There is a rather long-winded explanation here: https://support.microsoft.com/en-us/help/2915218/resolving-view-state-message-authentication-code-mac-errors[^] ,
but I think you simply need to upgrade your Windows / IIS version to a newer version.

Posted 19-Oct-19 22:07pm

RickZeeland