ZyXEL Communications ZyWALL USG Series Application Notes page 126

2 The policy configured in the previous step will display in the Policies section. Select Enable Anti-
Virus and Anti-Spyware and click Apply.
2.4.1 What Can Go Wrong
• The USG 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 USG is not
the endpoint (pass-through VPN traffic).
• T raffic through custom (non-standard) ports. The only exception is FTP traffic. The USG
scans whatever port number is specified for FTP in the ALG screen.
• ZIP file(s) within a ZIP file.
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