Validation of viewstate MAC failed.

Setting enableViewStateMac="false" should've fixed it. Maybe your browser is caching the pages somehow. Try clearing your browser's cache.

Aristotle

DiscountASP.NET
www.DiscountASP.NET

 

I am getting the following error when attempting to login into my application. I don't get the error on my machine on or any of my development servers, I am only getting it on the production server.

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.

I did a search on the web and the general consensus is that the following change to the web.config file should fix it but I've had no luck.

<pages enableViewStateMac="false" enableEventValidation="false" viewStateEncryptionMode="Never" maxPageStateFieldLength="10" validateRequest="false"


Has anyone else had this error? and if so do they know the fix for it?

Thanks,

P.