CyberGuard SG300 User Manual page 163

The Enable Access Control checkbox enables/disables the entire access control
subsystem. This box must be checked for any access control operation to take place.
The Default Action field defines the behaviour when none of the myriad of settings
positively allow or block access. If changed to block by default, some definitions must be
created elsewhere in access control to allow some network traffic or no access is
possible.
The Require user authentication checkbox determines if users are asked for a
username and password when attempting to access the web through the CyberGuard
SG appliance.
The Syslog level controls the level of debug output that is logged to the system log. The
higher this is set to, the more verbose the output. For normal operation, this should be set
to 0 or very large logs and a noticable system slow down might result. For normal
debugging, set this to 1. Higher levels need only be turn on when so directed by
CyberGuard support.
User authentication
Check Require user authentication if you want to require users to authenticate
themselves before browsing the web. When attempting to access a web site on the
Internet, their browser displays a dialog similar to the following:
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Firewall