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 »  Home  »  Windows Vista Troubleshooting Page 1  »  Configure L2TP IPsec Server Behind NAT-T Device
Configure L2TP IPsec Server Behind NAT-T Device
By  Super Admin  | Published  12/9/2006 | Windows Vista Troubleshooting Page 1 | Rating:
Configure L2TP IPsec Server Behind NAT-T Device
1. Log on to the Windows Vista client computer as a user who is a member of the Administrators group. 
2. Click Start, point to All Programs, click Accessories, click Run, type regedit, and then click OK. If the User Account Control dialog box is displayed on the screen and prompts you to elevate your administrator token, click Continue. 
3. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent
Note You can also apply the AssumeUDPEncapsulationContextOnSendRule DWORD value to a Microsoft Windows XP Service Pack 2 (SP2)-based VPN client computer. To do this, locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec
4. On the Edit menu, point to New, and then click DWORD (32-bit) Value. 
5. Type AssumeUDPEncapsulationContextOnSendRule, and then press ENTER. 
6. Right-click AssumeUDPEncapsulationContextOnSendRule, and then click Modify. 
7. In the Value Data box, type one of the following values: 0
A value of 0 (zero) configures Windows so that it cannot establish security associations with servers that are located behind NAT devices. This is the default value.
1
A value of 1 configures Windows so that it can establish security associations with servers that are located behind NAT devices.
2
A value of 2 configures Windows so that it can establish security associations when both the server and the Windows Vista-based or Microsoft Windows Server Code Name "Longhorn"-based VPN client computer are behind NAT devices. 
 
8. Click OK, and then exit Registry Editor. 
9. Restart the computer.
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