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}} Microsoft Forefront Unified Access Gateway (UAG), is a computer software solution that provides secure remote access to corporate networks for remote employees and business partners. It incorporates remote access technologies such as reverse proxy, virtual private network (VPN), DirectAccess and Remote Desktop Services. UAG was released in 2010, and is the successor for Microsoft Intelligent Application Gateway (IAG) which was released in 2007. UAG is part of the Microsoft Forefront offering. Microsoft is ending mainstream support for UAG in 2015. It is being replaced in part by the Windows Server 2012 R2 feature Web Application Proxy. == History == Unified Access Gateway was originally developed by a startup company named ''Whale Communications'' in Rosh HaAyin, Israel. One of the challenges it tried to solve in the 1990s was to develop a remote access solution based on a VPN mechanism but without direct network access from the remote client to the corporate network. This type of solution was specifically required by the Israeli military and government, to meet national information security standards. The technology developed was called the Air Gap and the communication between the external network and internal network was managed by two separate 1U rack-mount servers linked together by a memory bank accessed through a SCSI interface. On 18 May 2006, Microsoft announced that it would be acquiring Whale Communications. Microsoft completed the acquisition on 26 July 2006. Following this acquisition, the product was renamed Microsoft Intelligent Application Gateway Server 2007. With this version, the SCSI-based Air Gap was dropped, and the product was unified as a single-server appliance. Instead of using the Air Gap as the security barrier, IAG used Microsoft's ISA Server firewall product. IAG was offered to the public as a pre-installed appliance by Celestix Networks, IVO Networks, PortSys and nAppliance. In 2009, with the release of Service Pack 2 for IAG, the product was also offered directly to the public from Microsoft in the form of a virtual appliance - a pre-installed VHD which could be run on Hyper-V or VMware Workstation. In April 2008, Microsoft announced that the next generation of IAG will be named Forefront Unified Access Gateway. The product was released on 24 December 2009. Service Pack 1 for this product was released on 3 December 2010. Update 1 for Service Pack 1 was released on 17 October 2011 Service Pack 2 for this product was released on 6 August 2011. Service Pack 3 was released on 19 February 2013. Service Pack 4 was released on 27 November 2013. On 17 December Microsoft have announced that Microsoft will not deliver any future full version releases of Forefront UAG and the product will be removed from price lists on 1 July 2014〔http://blogs.technet.com/b/server-cloud/archive/2013/12/17/important-changes-to-the-forefront-product-line.aspx〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Microsoft Forefront Unified Access Gateway」の詳細全文を読む スポンサード リンク
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