Viewstate Error in Production Server (IIS 6.0/ASP.NET)

[Nishant]

Hi all,
We are facing a strange problem in our production environment. We are
running an ASP.NET web application under IIS 6.0 with Windows Server
2003 64-bit (There are 2 CPUs). The users are frequently getting an
"Invalid_Viewstate" error. The error description is "Unable to validate
data".
The exception is "System.Web.HttpException: Authentication of viewstate
failed"

Can anyone help?

-- Nishant

 

[Nishant]

Thanks Peter,

I already implemented, what ever you have suggested. I found another
problem in machine.config file ViewStateMac and validateRequest
attributes was enabled which should be by default disabled, so, I
dissabled it and no body has reported that error once again.

Nishant