Validation of viewstate mac failed in IIS 7.5 and 2008 R2

Asked Nov 02 '18 at 06:07

Active Nov 02 '18 at 06:25

Viewed 156 times

I'm getting the below error

Validation of viewstate MAC failed. If this application is hosted by a web farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

When checked at the below url

https://support.microsoft.com/en-sg/help/2915218/resolving-view-state-message-authentication-code-mac-errors

states the cause to be one of

Cause 1: The web application is running in a farm multi-server environment (Mine is not running in a farm)

Cause 2: The worker process uses the IIS 7.0 application pool identity (I'm using IIS7.5 and Windows 2008 R2).

Cause 3: The application pool is configured by using LoadUserProfile=false

(I'm not using DefaulaAppPool and have a separate pool for my application Identity type is Custom Identity LoadUserProfile = True)

Cause 4: The Page.ViewStateUserKey property has an incorrect value (no such feature is enabled for CSRF)

I'm targeting Dot Net version v4.0

What could be the possible cause for the error ?

Note: if somebody wishes to mark this as a duplicate, please think over twice. thanks

edited Nov 02 '18 at 06:25

asked Nov 02 '18 at 06:07

luckyluke

what version of the framework are you targeting? – jazb Nov 02 '18 at 06:11
do you have somethng like this in your config? `` – jazb Nov 02 '18 at 06:15
@JohnB sorry, I'm targetting v4.0 (have updated it ) – luckyluke Nov 02 '18 at 06:26
no entry is present @JohnB – luckyluke Nov 02 '18 at 06:27
have you seen this? https://stackoverflow.com/questions/1878900/validation-of-viewstate-mac-failed?rq=1 – jazb Nov 02 '18 at 06:28
1

or this: https://blogs.msdn.microsoft.com/tom/2008/03/14/validation-of-viewstate-mac-failed-error/ – jazb Nov 02 '18 at 06:29
@JohnB will update the outcome – luckyluke Nov 02 '18 at 06:44

Validation of viewstate mac failed in IIS 7.5 and 2008 R2

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