This scenario includes VPN servers that are running Windows Server 2008 and Windows Server 2003.īecause of the way in which NAT devices translate network traffic, you may experience unexpected results in the following scenario: If the virtual private network (VPN) server is behind a NAT device, a Windows Vista or Windows Server 2008-based VPN client computer can't make a Layer 2 Tunneling Protocol (L2TP)/IPsec connection to the VPN server. For more information about how to back up and restore the registry, see How to back up and restore the registry in Windows.īy default, Windows Vista and Windows Server 2008 don't support Internet Protocol security (IPsec) network address translation (NAT) Traversal (NAT-T) security associations to servers that are located behind a NAT device. Then, you can restore the registry if a problem occurs. For added protection, back up the registry before you modify it. Therefore, make sure that you follow these steps carefully. However, serious problems might occur if you modify the registry incorrectly. This section, method, or task contains steps that tell you how to modify the registry.
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