User's Manual

45
3.7.3 Keyword lter
Keyword lter blocks access to webpages containing specied
keywords.
To set up a keyword lter:
1. From the navigation panel, go to Advanced Settings >
Firewall > Keyword Filter.
2. On the Enable Keyword Filter eld, select Enabled.
3. Enter a word or phrase and click the button.
4. Click Apply.
NOTES:
• The Keyword Filter is based on a DNS query. If a network client
has already accessed a website such as http://www.abcxxx.com,
then the website will not be blocked (a DNS cache in the system
stores previously visited websites). To resolve this issue, clear the
DNS cache before setting up the Keyword Filter.
• Web pages compressed using HTTP compression cannot be
ltered. HTTPS pages also cannot be blocked using a keyword
lter.