ZyXEL Communications ZyWall 110 User Manual page 1030

The Zyxel Device checks the ports and conditions configured in application patrol entries in the order
they appear in the list. While this sequence does not affect the functionality, you might improve the
performance of the Zyxel Device by putting more commonly used ports at the top of the list.
The Zyxel Device's anti-virus scanner cleaned an infected file but now I cannot use the file.
The scanning engine checks the contents of the packets for malware. If a malware pattern is matched,
the Zyxel Device removes a portion of the file, while the rest goes through. Since the Zyxel Device erases
a portion of the file before sending it, you may not be able to open the file.
The Zyxel Device sent an alert that a virus-infected file has been found, but the file was still
forwarded to the user and could still be executed.
Make sure you enable Destroy Infected File in the Configuration > UTM Profile > Anti-Virus > Profile: Profile
Management > Add screen to modify infected files before forwarding to the user, preventing them from
being executed.
I added a file pattern in the anti-virus white list, but the Zyxel Device still checks and modifies files
that match this pattern.
Make sure you select the Check White List check box above the white list table. If it is already selected,
make sure that the white list entry corresponding to this file pattern is activated.
The Zyxel Device is not scanning some zipped files.
The Zyxel Device cannot unzip password protected ZIP files or a ZIP file within another ZIP file. There are also limits to
the number of ZIP files that the Zyxel Device can concurrently unzip.
The Zyxel Device is deleting some zipped files.
The anti-virus policy may be set to delete zipped files that the Zyxel Device cannot unzip. The Zyxel
Device cannot unzip password protected ZIP files or a ZIP file within another ZIP file. There are also limits
to the number of ZIP files that the Zyxel Device can concurrently unzip.
The Zyxel Device's performance seems slower after configuring IDP.
Chapter 50 Troubleshooting
ZyWALL USG Series User's Guide
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