Appliance Trim Kit User Manual

Appendix A: Glossary

explicit proxy A configuration in which the browser is explicitly configured to communicate with

the proxy server for access to content.

This is the default for the SG appliance, and requires configuration for both browser

and the interface card.

extended log file format

(ELFF)

A variant of the common log file format, which has two additional fields at the end of

the line—the referer and the user agent fields.

fail open/closed Failing open or closed applies to forwarding hosts and groups and SOCKS gateways.

Fail open or closed applies when health checks are showing sick for each forwarding

or SOCKS gateway target in the applicable fail-over sequence. If no systems are

healthy, the SG

appliance fails open or closed, depending on the configuration. If

closed, the connection attempt simply fails.

If open, an attempt is made to connect without using any forwarding target (or

SOCKS gateway). Fail open is usually a security risk; fail closed is the default if no

setting is specified.

filtering See content filtering.

forward proxy A proxy server deployed close to the clients and used to access many servers. A

forward proxy can be explicit or transparent.

FTP See Native FTP; Web FTP.

gateway A device that serves as entrance and exit into a communications network.

hardware serial number A string that uniquely identifies the appliance; it is assigned to each unit in

manufacturing.

health check tests The method of determining network connectivity, target responsiveness, and basic

functionality. The following tests are supported:

•ICMP

•TCP

• SSL

• HTTP

• HTTPS

•Group

• Composite and reference to a composite result

•ICAP

• Websense

• DRTR rating service