I have a login control and I tried to set the default button as the submit button within my form tag in the login page.
But, I am getting the following error.
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 already generated the machine key.
Any clue!