Zyxel ZyWALL USG 20 [57/150] What can go wrong

Chapter 3 Protecting Your Network

ZyWALL USG 20-2000 User’s Guide

2 The policy configured in the previous step will display in the Policies section. Select Enable Anti-

Virus and Anti-Spyware and click Apply.

3.5.1 What Can Go Wrong

• The ZyWALL does not scan the following file/traffic types:

• Simultaneous downloads of a file using multiple connections. For example, when you use

FlashGet to download sections of a file simultaneously.

• Encrypted traffic. This could be password-protected files or VPN traffic where the ZyWALL is

not the endpoint (pass-through VPN traffic).

• Traffic through custom (non-standard) ports. The only exception is FTP traffic. The ZyWALL

scans whatever port number is specified for FTP in the ALG screen.

• ZIP file(s) within a ZIP file.