Web Filtering

STEP 5 If there is no pattern match in the URL Block List, the device checks to see if the Web Filter Service is licensed and enabled. If it is enabled, the device contacts the Web Filter Service server to determine if the URL matches a category included in the Web Filter Service data- base. If a match is found in a blocked category, the request is filtered executing the action configured for the Web Filter Service: block only, log only, block and log. If a match is found in a permitted category, the request is served and access is allowed.

STEP 6

STEP 7

Note A local cache is available for the Web Filter Service to speed up the filtering process.

If the request is not a member of a currently filtered category or covered by an entry in the Custom Filter List, the Web Filter Service is not licensed, or the CPA Server cannot be contacted by device, the web filtering default rule is applied. The default rule can be configured with one of the following actions:

•Allow unclassified or unknown sites or

•Filter unclassified or unknown sites - which means the filtering action that you specify will be applied

If the firewall web-filter rule has logging enabled, and the device denies access to a web site based on the Custom Filter List or the Web Filter Service, a “Warning” level Security event is sent to the Firewall Block Log. For allowed requests, “Informational” events are logged in the Firewall Session Log.

For additional information, see the following topics:

•“Setting Up Web Filtering” on page 87

•“Web Filtering Page” on page 88

•“Web Filter Service” on page 90

•“Custom Filter List” on page 92

Setting Up Web Filtering

The following steps provide an overview of the web filter configuration process:

STEP 1

STEP 2

STEP 3

STEP 4

Configure general web filtering settings. These settings determine the device response to web requests when the Web Filtering options are enabled.

For details, see “Web Filtering Page” on page 88

If you are using the Web Filter Service, configure the Web Filter Service settings.

For details, see “Web Filter Service” on page 90.

If you are using the Custom Filter List, configure the Permit and Block URL lists.

For details, see “Custom Filter List” on page 92.

Configure a firewall rule to apply web filtering.

For details, see “Configuring Firewall Rules” on page 71.

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