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Validation of viewstate MAC failed Error after Uploading to Web Server

Posted By:      Posted Date: October 21, 2010    Points: 0   Category :ASP.Net
 

I'm trying to figure out this error but I can't point out what's exactly causing this.

Here is what's happening.

User loggs in for a few hours and gets "Validation of viewstate MAC failed" Error after post back.

I have set timeout in Web.config as follow.

<authentication mode="Forms">
            <forms timeout="540" slidingExpiration="true" loginUrl="~/maintain/login.aspx" />
</authentication>


in IIS I have set

ApplicationPool - Idle Time-out 60min

Sesstion State - Cookei Settings Mode: User Cookies, Time-out: 540min


And I'm using this ifame to prevent Idle

http://wiki.asp.net/page.aspx/1086/keep-session-alive/


Emplyee logges in for 8 hours and having this issue a few time a day...


Do you know what else I should look?

I don't know why session expires.


Thank you for your help

Emplyee







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