Secure Computing SG300 User Manual page 186

All new content filtering subscriptions are for the Webwasher service. The old content
filtering system is maintained for backwards compatibility for existing subscribers only.
If you have been given a single license key, you have a subscription to the original
Content system. If you have been given a certificate and private key, you have a
subscription to the new Webwasher system.
Webwasher
Check Enable content filtering and paste in your Certificate and Private key.
Check Allow accesses that cannot be rated to allow access to web sites that the
Webwasher content filtering system has not yet rated. The default behavior is to block all
unrated sites.
The SnapGear unit dynamically retrieves rating categories from the Webwasher server.
As such, new categories may be added after content filtering is configured on your
SnapGear unit.
Unchecking Allow access to newly defined categories restricts access to the
categories you did not block when configuring content filtering. Leaving Allow access to
newly defined categories checked allows access to any categories added after content
filtering is configured.
Check Identify users by account to send user names to the Webwasher reporting
service. In order for this field to have any effect, Require User Authentication on the
Main tab must be checked.
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Firewall