Viewstate MAC Validation Errors and DNN

In our log we have an awful lot of viewstate mac validation errors.  Verifying the state of the viewstate is a good security feature, this page documents possible causes and fixes. http://support2.microsoft.com/kb/2915218.

However none of the causes seem to fit our case.
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Cause 1: The web application is running in a farm (multi-server environment)

  We are not in a web farm. 

Cause 2: The worker process uses the IIS 7.0 application pool identity

  We are using IIS 7.5, and in that version it is not an issue.

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

  That setting is set to true for our app pool.

Cause 4: The Page.ViewStateUserKey property has an incorrect value

  Nothing we are doing is modifying this.  

 

Cause 4 made me think about the CMS DNN.  So I googled the error and DNN.


http://blog.janjonas.net/2013-04-18/dotnetnuke-workaround-validation-viewstate-failed-exception-dnn_7-login-form/comment-page-1#comment-38855

And lol and behold it was indeed nuke.  A security feature in DNN causes this sometimes when a login status changes on a login page.  DNN modifies the Page.ViewStateUserKey.  That link has a fix.

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