Zyxel ZyWALL USG50 Internet Security Firewall with Dual-WAN, 4 Gigabit LAN/DMZ Ports, 5 IPSec VPN, SSL VPN, and 3G WAN Support: Amazon.co.uk: Computers & Accessories
VPN - Configure SSL VPN via SecuExtender [Stand-alone mode] – Zyxel Support Campus EMEA
Amazon.com: Zyxel High Performance 2GbE SPI/500Mbps VPN Firewall with 200 IPSec and 50 SSL VPN, 8 GbE Ports and High Availability (ZyWALL310) : Electronics
ZyWALL/USG] How to change the SSL VPN Server port on the security gateway (WebUI) – Zyxel Support Campus USA