Microsoft Forefront Threat Management Gateway (TMG) 2010 enables Layer 2 Tunneling Protocol (L2TP) site-to-site connections in Routing and Remote Access Services (RRAS). This occurs even when only a Point-to-Point Tunneling Protocol (PPTP) site-to-site virtual private network (VPN) connection is enabled in the TMG 2010 Microsoft Management Console (MMC).
To resolve this problem, install the service pack that is described in the following Microsoft Knowledge Base article:
2649961 Rollup 1 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 2617060 - Last Review: Jan 11, 2012 - Revision: 1