Windows Server 2008 R2 is a server operating system and the fourth release of Windows Server produced by Microsoft as part of the Windows NT family of operating systems. It was released to OEM hardware partners on July 22, 2009 and became generally available on October 22, that year.
The Windows 2008 R2 (SBS) machine was earlier setup to run a PPTP VPN server. Due to security concerns I do want to replace the PPTP by L2TP/IPsec VPN server. The server is behind a NAT router where 3 forward rules to the Windows Server are created: protocol 50 (ESP) port UDP 500 (IKE) port UDP 4500 (NAT traversal) Configure NPS for VPN in Windows Server 2008 R2 - YouTube Jun 25, 2017 Server 2008 R2 PPTP VPN With 1 Nic | The Sysadmins
How to Configure VPN server in Windows Server 2008 R2
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How to setup L2TP IPsec VPN server on Windows Server 2008 R2?
Find answers to Setting up L2TP IPSec VPN on Windows 2008 R2 Server from the expert community at Experts Exchange VPN Connections in Windows Server 2008 R2 and 2012 - 1 Sep 07, 2012