D-Link DFL-700 - Manual (Page 120)

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2. Make sure the http-outbound service exists and is using the HTTP ALG,
Firewall->Services:
Find the http-outbound service in the list and click Edit. If there is no service with
that name you will have to create one by clicking Add new at the bottom of the list.
TCP / UDP Service should be selected and protocol should be set to TCP.
Set destination port to 80.
Select HTTP/HTML Content Filtering in the ALG dropdown.
Click Apply
3. Now add a policy rule that uses this service, Firewall->Policy:
Click LAN->WAN
Click Add new