How to configure an L2TP/IPsec server behind NAT

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INTRODUCTION Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 How to back up and restore the registry in Windows By default, Windows Vista and the Windows Server 2008 operating system do not support Internet Protocol security (IPsec) network address translation (NAT) Traversal (NAT-T) security associations to servers that are located behind a NAT device. Therefore, if the virtual private network (VPN) server is behind a NAT device, a Windows Vista-based VPN client computer or a Windows Server 2008-based VPN client computer cannot make a Layer Two...
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VPN Only Shows Some But Not All Folders – Offline Files Issue

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The issue is that when connected to VPN, only a small subset of folders appear in a network drive.  For example maybe a network shared drive has 20 folders but when connected to VPN only 3 of those 20 folders appear.  This could be due to an Offline Files issue where certain folders are synced between the computer and the server for some reason but the other folders are not.  Only the synced folders appear when connected to VPN.  You could disable Offline Folders which should stop the sync and force the computer to show all folders or try the following to disable Slow Link Detection and thus prevent Windows from displaying only synced folders.   Disable the Configure Slow-Link Mode Group Policy Computer Configuration – Administrative Templates – Network – Offline Files – Configure Slow-Link Mode (disable turns it off)   Set Configure Group Policy Slow Link Detection to 0 (All connections are Fast) Computer Configuration –...
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