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Chapter 28 Anti-Virus
ZyWALL USG 100/200 Series User’s Guide
471
" Since the ZyWALL erases the infected portion of the file before sending it, you
may not be able to open the file.
Notes About the ZyWALL Anti-Virus
The following lists important notes about the anti-virus scanner:
1 The ZyWALL anti-virus scanner can detect polymorphic viruses.
2 When a virus is detected, an alert message is displayed in Microsoft Windows
computers. Refer to Appendix C on page 819 if your Windows computer does not
display the alert messages.
3 Changes to the ZyWALL’s anti-virus settings affect new sessions (not the sessions that
already existed before you applied the changed settings).
4 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.
Finding Out More
• See Section 5.4.14 on page 118 for related information on these screens.
• See Section 28.7 on page 480 for anti-virus background information.
28.1.3 Before You Begin
• Before using anti-virus, see Chapter 8 on page 185 for how to register for the anti-virus
service.
• You may need to customize the zones (in the Network > Zone) used for the anti-virus
scanning direction.
28.2 Anti-Virus Summary Screen
Click Anti-X > Anti-Virus to display the configuration screen as shown next.