Validation of viewstate MAC failed

N

Not Me

Hi,

Would appreciate some advice on the following.. I'm getting the error
mentioned in the subject on my app.. but only in specific cases. That
is, when I open a login page (which uses forms authentication) and
leave things a while (5+ minutes?) before clicking the login button.
Refreshing just returns the error again, but if I just click the URL/go
in my browser, it loads fine and I can proceed with no further issues.

I'm not on a webfarm, and (obviously from my description) I'm not
pressing any buttons before the page has fully loaded. Also all I have
on this page is the basic login controls, nothing that would alter any
form tags or hidden fields. Another issue I've read up on is
application pool recycling.. I don't think it's that, as I can
reconstruct the error most of the time.

Any ideas? on any other page, if choose to leave things a while before
clicking on, I'm just shown the login screen as expected with no other
issues.

Many thanks,
Chris
 

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