Gettings this Error on My IIS 6 reports

[taga_ipil]

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"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."

Any Idea what causes the issue?
try na naku ang ghatag sa Microsoft murag wala man effect...

small ideas are highly appreciated...

Thanks

[twisted_180]

are you running a form? if so, the most common scenario is you are running IIS 6 and the worker process is recycling and a user posts back, but since they have the old validation key, they are unable to validate the viewstate. The best recommendation I can make is to set the validationKey manually in Web.config.

[taga_ipil]

Thanks bro...
but we have a load balance site...
we have two identical website running at the same time.
They are both running under LOCAL DIRECTOR MACHINE.

Machine key should not be the same with the other server or else this will cause an error..