Sitecom WLR-4002B - If the VPN Type of the tunnel you have set up in the WLR-4002 B is L2 TP over IPSec You have also entered a Shared key in the WLR-4002 B(see step 7 of chapter Using the Wizard to Configure the WLR-4002 B for L2 TP over IPSec for reference). Click on IPSec Settings…; Check Use pre-shared key for authentication. Key, Enter the shared key you have entered in the WLR-4002 B.

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14a. If the VPN Type of the tunnel you have set up in the WLR-4002B is L2TP
over IPSec You have also entered a Shared key in the WLR-4002B(see
step 7 of chapter Using the Wizard to Configure the WLR-4002B for
L2TP over IPSec for reference).
Click on IPSec Settings…
14b. Check Use pre-shared key for authentication.
Key, Enter the shared key you have entered in the WLR-4002B.