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Hi,
I'm seeing this error happening on ASP.NET 2.0 sites with a slightly different error message ("Validation of viewstate MAC failed.") which basically boils down to the same error you're getting.
Analyzing the hostnames of the requests generating such errors, most of the time the hostname seems to indicate the request came from a hosted environment, eg. not a person's home or office pc or anything. My guess is this error is caused by webcrawler apps that don't resend the viewstate in a request like they're supposed to, possibly in an attempt to gain access to your site. In other words, I think these errors are hack attempts using software that does not sufficiently imitate browser behavior.
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Expert:
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notpingu
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Date:
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Apr 03, 2007
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Time:
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13:10
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Expert:
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nidhi
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Date:
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Apr 12, 2007
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Time:
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05:31
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thanks for your answers, guys, and sorry for not getting back quicker.
It is not a web crawler problem, notpingu, I'm quite sure about that.
nidhi, i've been looking at the solutions you provided links for and i think it's a problem of the viewstate being too big. this is not so easy for me to fix, so right now i've implemented the serverside viewstate as described in the last link you provided. this seems to do the trick.
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Expert:
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dustPuppy
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Date:
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May 06, 2007
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Time:
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05:45
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