- Log on to the Windows Vista client computer as a user who is a member of the Administrators group.
- Click StartStart button, 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.
Locate and then click the following registry subkey:
- Note You can also apply theAssumeUDPEncapsulationContextOnSendRule
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:
On the Edit menu, point to New, and then click DWORD (32-bit) Value.
- Type AssumeUDPEncapsulationContextOnSendRule, and then press ENTER.
- Right-click AssumeUDPEncapsulationContextOnSendRule, and then click Modify.
- Select “2” configures Windows so that it can establish security associations when both the server and the Windows Vista-based or Windows Server 2008-based VPN client computer are behind NAT devices.
- Click OK, and then exit Registry Editor.
- Restart the computer.