Error "That assembly does not allow partially trusted callers"

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There is an error message “That assembly does not allow partially trusted callers” after applying Application server update downloaded from internet.

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This error also produces a typical entry in the server log:
Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data failed.

This happens when you download updated ORIGAM bin files and Windows will “block” them as untrusted. You have to right-click on the ZIP file, go to Properties and select Unblock. Then copy the files to your IIS folder again.

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