Validation of viewstate MAC failed,..

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Hi all.
I have an error when access my webpage.Sometimes it appear.
"Validation of viewstate MAC failed. If this application is hosted by anh Web Farm or cluster, ensure that <machinekey> configuration specifies the same validationKey and validation algorithm. AutoGenerate can not be used in a cluster."

Posted 20-Jun-12 15:52pm

NguyenVanDuc

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Prasad_Kulkarni · Answer 1 · 2012-06-20T17:48:00

Refer:
Validation of viewstate MAC failed error[^]

Here's a good article on MSDN:
http://msdn.microsoft.com/en-us/library/ms998288.aspx[^]
You get some useful information, for sure.

Another solution you can find here:
"Validation of ViewState Mac failed" exception[^]

Similar discussion:
Validation of viewstate MAC failed[^]