H3C Technologies H3C SecBlade IPS Cards - Manual (Page 147)

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Configuration Guidelines
1) You cannot delete a URL filtering policy that has been applied to a segment. Remove all related
policy applications before you can delete the applied URL filtering policy.
2) You cannot delete the system default URL filtering policy and rule.
3) On a segment, only one URL filtering policy application will be used for a packet, if any. If a packet
matches multiple URL filtering policy applications, the policy application with the smallest IP
address scope is used. If two policy applications have the same IP address scope, the one
configured earlier has a higher priority.
4) If a step fails during the creation of a URL filtering policy, all executed steps are cancelled. However,
the failure of a step during the modification of a URL filtering policy does not cancel executed steps.
5) To implement category-based URL filtering, make sure the normal communications between the
device and the specified URL category server. After specifying a URL category server properly and
activating the configurations, you can view the connection status between the device and the URL
category server by displaying the system logs.