The Security Agent must be installed on:
Windows Vista (all editions)
Windows Server 2008 (all editions)
Windows 7 (all editions)
Windows SBS 2011
Windows 8 (all editions)
Windows Server 2012 (all editions)
It cannot be installed on Windows Server/SBS 2003 and Windows XP because these operating systems only support IPv6 addressing partially.
It is preferable for a Security Agent to have both IPv4 and IPv6 addresses as some of the entities to which it connects only support IPv4 addressing.