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I am getting the following error when the user tries to submit a form, it only happens sometimes... Not sure how to resolve or what the root cause could be. Any help is appreciated. Please see below for screenshot..
Framework 4.0, IIS7 http://s12.postimage.org/69txogmwr/Untitled.png

user1048852
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  • The answer here (http://stackoverflow.com/questions/576990/should-i-ignore-the-occasional-invalid-viewstate-error) may help you out. If I had to guess I'd say check the machine key settings. I've seen this error happen when an application recycles and a machine key is not set. – rsbarro Nov 16 '11 at 03:22

1 Answers1

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Things that I have seen cause this:

  • machinekeys out of sync in a webfarm
  • page loads slow and the user posts back before it's finished
  • page sits idle after partial postbacks and the app pool is recycled
  • page sits idle, new code is deployed for page/controls, first postback dies due to mismatched controls
rick schott
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