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QuestionValidation of viewstate MAC failed for ASP.NET 4.0 application PinmemberMember 98165276-Feb-13 12:24 
Hi,
 
I am getting the below error in my ASP.NET 4.0 web application:
 
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 started getting this error when I added the below tag in web.config to encrypt the viewstate:
 
<pages enableEventValidation="true" controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID" enableViewStateMac="true" viewStateEncryptionMode="Always"/>
<machineKey validationKey="9EFA2D2E71A1BC8ECAF76E2377F29E61AB0214D893EBDBBD49C594A94FB0A2336BA3023F1578BFFE7ACD09C56872885537D07F5FA8FFF0FE4CD8B0E955A02845" decryptionKey="3EBF84F260F8883A69379502DF6DC999ADCAAA90885EAB1BD0423CEED13526A4" validation="SHA1" decryption="AES"/>
 
I looked for lot of solutions on aspnet forums and Internet but nothing worked. If I change the viewStateEncryptionMode to "Auto" or "Never", then the page loads fine. But that would make my application insecure and security is my prime objective.
 
FYI:My application is deployed on a Windows 2008 R2 server and not on a webfarm.
 
Any solution to solve this issue?

AnswerRe: Validation of viewstate MAC failed for ASP.NET 4.0 application PinmentorKeith Barrow6-Feb-13 13:33 
AnswerRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban11-Feb-13 5:46 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmembersmehta.er12-Feb-13 7:28 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban13-Feb-13 6:24 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmembersmehta.er13-Feb-13 6:44 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban13-Feb-13 6:45 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmembersmehta.er14-Feb-13 8:10 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban7-Mar-13 6:27 
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