Simulate Validation of viewstate MAC failed at home

In my webSite , if i do postback after 5 minuts I get this error: Validation of viewstate MAC failed...

I realized it was probably because it's idle-timeout of the application pool My site sits on plesk server. My site is not u开发者_高级运维se server farm, just one server. I try to simulate the error on my computer and I can not. I have windows 7 with iis7, i changed the application pool idle timeout to 1 minute and submit a postback after 2 minute, but i did not get any error, the page refresh ok. and it is the same page like i have in the real server.

so, how can I Simulate that error at home on my pc?

thx

micha

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In your web.config, try adding the following:

<system.web>
    <pages enableViewStateMac="false" />
</system.web>