P-2608HWL-Dx Series 802.11g Wireless ADSL2+ VoIP IAD User's Guide

P-2608HWL-Dx Series User’s Guide
248 Chapter 18 IPSec VPN
18.9 VPN and Remote Management
If a VPN tunnel uses Telnet, FTP, WWW, then you should configure remote management
(Advanced > Remote Management) to allow access for that service.