Hello,
I am getting "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."
My work Around:-
1) I have installed Kentico with Template"Corporate Site" on the server.
2) After installation i was able to open the site with localhost:77 domain.
3) After this, i have create one another site by importing the zip package.
4) When i am trying to login in the live version of this imported site i am getting above error mentioned.

Solution Tried:
1) I have tried to generate Machine key for my site in IIS and putted it in web.config but not working
2) Also i have set enableViewStateMac="false" in page tag in web.config and still not working.

Can you please help me out for this.....

Thanks