Tag Archive for ViewState

Validation of viewstate MAC failed in AddWrkfl

I recently added a delegate control to a SharePoint solution. The delegate control was used to dynamically insert a custom user control into the master page. Part of the functionality of this control required the use of hidden fields.

Everything worked perfectly until I tried to add or update a workflow against a list. After clicking Next on the add workflow page, the following error was thrown:

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
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