- You create a Layer 2 Tunneling Protocol (L2TP) virtual private network (VPN) connection to a server. The server has Microsoft Forefront Threat Management Gateway (TMG) 2010 installed.
- You change or apply an access rule by using the Forefront TMG Microsoft Management Console (MMC) snap-in window.
Forefront TMG uses RRAS to set the L2TP shared secret value. However, RRAS invalidates the L2TP VPN connection. Therefore, the L2TP VPN connection is disconnected every time that the configuration is reloaded.
Update informationTo resolve this issue, install the software update that is described in the following Microsoft Knowledge Base (KB) article:
Article ID: 2449127 - Last Review: Nov 17, 2010 - Revision: 1