The purpose of UAG is to provide “remote access” (more an employee term) and “application publishing” (more a partner or customer term). This means that UAG has to be ready to “talk” to people that are not IT specialists at all. Security policy
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Read the complete post at http://blogs.technet.com/fesnouf/archive/2010/03/16/changing-the-policy-error-message-graphical.aspx