SSRS Error : operation cannot run due to current state of the object + Solution

Problem :
I have a On_hand_Quantity report which has a parameter drop down to select about 200 stores.
When i run this report in BI studio , selecting all the 200 stores for the parameter it works fine.
But when i upload the same report to report manager and try selecting all the store_numbers it errors out saying 'operation cannot run due to current state of the object '
This report was running fine since the past 2 years, on 30th dec we did some .NET updates (KB2656356 and KB2656351) after which this report stopped working.

Solution :

You don't have to uninstall the patch; the default value of MaxHttpCollectionKeys is set to 1000 by the security patch. You can override the value by adding the following key to the appsetttings section in your SSRS report manager web.config file (usually in Program Files\Microsoft SQL Server\MSRS10.MSSQLSERVER\Reporting Services\ReportManager)
<add key="aspnet:MaxHttpCollectionKeys" value="10000" />
10000 is just a suggestion, you can set it to the value of your liking.
We did this change and the reports worked for us.

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