SonicWALL Internet Security Appliances - Manual (Page 100)

Content Filtering and Blocking Page 101
Trusted Domains
Trusted Domains can be added in the Restrict Web Features section of the Configure tab. If you trust
content on specific domains, you can select Don’t block Java/ActiveX/Cookies to Trusted Domains
and then add the Trusted Domains to the SonicWALL using the Add Trusted Domain field. Java
scripts, ActiveX, and cookies are not blocked from Trusted Domains if the checkbox is selected.
Message to display when a site is blocked
Enter your customized text to display to the user when access to a blocked site is attempted. The
default message is Web Site blocked by SonicWALL Filter. Any message, including embedded HTML,
up to 255 characters long, can be entered in this field.
URL List
The URL List page allows you to see the status of the Content Filter List as well as configure
a specific time to download the list. You can also determine how the SonicWALL responds
when a Content Filter List is unavailable. Selecting categories to block is also configured
on this page.
List Status
This section of the URL List tab indicates the status of the URL list. If the Content Filter List is loaded,
a status message is displayed in this section.
List Updates
It is important to note that Host names, and not TCP/IP addresses, are used for all filtering. Many
blocked sites operate server pools, where many computers service a single host name, making it
impractical and difficult to add and maintain the numerical addresses of every server in the pool.
Many sites included in the Content Filter List regularly change the IP address of the server to try to
bypass Content Filter Lists. For this reason, maintaining a current list subscription is critical for
effective content filtering.