Session Problem or any don't guess.

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After session time-out, when I click on any button in my application I get the following error:

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.</machinekey>

Please help me to resolve this.

Posted 28-Jun-11 1:41am

SafdarJahan

Updated 28-Jun-11 1:45am

R. Giskard Reventlov

v4

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Prerak Patel · Answer 1 · 2011-06-28T01:46:00

Solution 1

Try setting <pages enableeventvalidation="false" viewstateencryptionmode="Never">

Ref: http://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx[^]

Posted 28-Jun-11 1:46am

Prerak Patel

**R. Giskard Reventlov** · Answer 2 · 2011-06-28T01:46:00

Solution 2

Perhaps this might get you started: Validation of viewstate MAC failed error[^].

Posted 28-Jun-11 1:46am

R. Giskard Reventlov

Toniyo Jackson · Answer 3 · 2011-06-28T01:48:00

Solution 3

Check the same discussion here.

http://forums.asp.net/t/955145.aspx[^]

Posted 28-Jun-11 1:48am

Toniyo Jackson

#realJSOP · Answer 4 · 2011-06-28T01:48:00

Solution 4

I googled the error and got 12,000 results back.

Here's one:

http://forums.asp.net/t/955145.aspx?PageIndex=20[^]

If that doesn't answer your question, here is a link[^] to all 12000 results.

Posted 28-Jun-11 1:48am

#realJSOP