Monday, 14 January 2008

Validation of viewstate MAC failed....

Getting this error just after release to prod. Its a simple .NET 3.5 app without any web farms etc... this thread suggests the following solution is to update your web.config as following..

<pages validaterequest="false" enableeventvalidation="false" viewstateencryptionmode="Never">

Thread title is
Validation of viewstate MAC failed / The state information is invalid for this page and might be corrupted

Thread link is

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