Error Validation of viewstate MAC failed

[zachariahyoung]

Anybody know why I'm getting this error on the recordings page?

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.

Most times I just ftp over the web.config and it fixes the issue.

Thanks

Zach

[Michael D. Brown]

Are you on a cluster? Is there a reverse proxy between the IIS Server and
the web. Enabling the MAC is used as an extra security check (avoid
interception of a valid request and making malicious changes) if security
isn't an issue, you can just disable MAC.
http://www.dotneat.net/2008/12/13/ASPNETMVCValidationOfViewstateMACFailedErr
or.aspx

[Michael D. Brown]

Even better than that configure ASP.NET to use server side view state
http://www.codeguru.com/vb/vbnet30/article.php/c13931/

--Mike

[Zachariah Young]

Our code is running on discountasp.net.  Someone provided me this post last night http://community.discountasp.net/showthread.php?t=2719.

 

I appied that suggestion but still was having issue.

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[Lance Farquhar]

Because it is in Web Farm the key is different per machine. Add the key to the web config and you should be all set.