Secure Computing SG300 User Manual page 168

In the row labeled HTTP, enter your SG unit's LAN IP address in the Proxy address to
use column, and 81 in the Port column. Leave the other rows blank.
In the Exceptions text box, enter your SG unit's LAN IP address.
Click OK, OK and OK again.
ACL
Access may be Blocked or Allowed by the Source (LAN) IP address or address range,
the Destination (Internet) host's IP address or address range, or the Destination Host's
name.
Addresses are added through Definitions -> Addresses, refer to the Definitions section
earlier in this chapter for further detail.
Note
All Internet traffic, not just web traffic, is affected by ACL.
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Firewall