Invalid postback or callback argument error after installing KB2894855 on windows server 2012

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Hi All,

After installing http://support.microsoft.com/kb/2894855[^]
This update on my webserver (windows server 2012)

While doing cross page posting, I am getting the following error.

Invalid postback or callback argument. Event validation is enabled using <pages enableeventvalidation="true"> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Note: This error is not getting when I changed enableEventValidation="false" in my webconfig/Page attribute. Which I am not suppose to do as per the security aspects.

Posted 31-Dec-14 1:19am

Renju Vinod

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Member 4653839 · Answer 1 · 2014-12-31T01:25:00

Solution 1

Hi Renju,

This issue will come only when we use same control id in the request page and the current page.

try generating dynamic control id based on the page by which we can come out from these kind of validation issues.

Hope this will help !!!

Posted 31-Dec-14 1:25am

Member 4653839

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Renju Vinod 31-Dec-14 7:30am

Hi,
Thanks for the solution, any alternative solution as this required a huge change in my current site.

Invalid postback or callback argument error after installing KB2894855 on windows server 2012

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Invalid postback or callback argument error after installing KB2894855 on windows server 2012

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