The SSG5 and SSG20 have both reached end of service and are no longer supported. If you need SSG5 or SSG20 documentation anyway, please see below.
For information about a currently supported security device that might better suit your needs, check out the SRX300 Services Gateway.
The SRX300 line of firewalls are small desktop firewalls for small branch or retail offices. They support next-generation firewall features such as secure intrusion prevention, application visibility and control, and content security features that include anti-virus, anti-spam, and enhanced Web filtering. Additionally, WAN or Internet connectivity and Wi-Fi module options include:
Ethernet, T1/E1, ADSL2/2+, and VDSL
3G/4G LTE wireless
802.11ac Wave 2 Wi-Fi