ZyXEL Communications USG-300 - V2.20 ED 2 Manual page 206

Chapter 8 L2TP VPN Example
Select
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HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\P
arameters.
Figure 192 Registry Key
Right-click Parameters and select New > DWORD Value.
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Figure 193 New DWORD Value
Enter ProhibitIpSec as the name. And make sure the Data displays as 0's.
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Figure 194 ProhibitIpSec DWORD Value
Restart the computer and continue with the next section.
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ZyWALL USG 300 User's Guide