27. firewall
The term "fire wall" originally meant, and still means, a fireproof wall intended to prevent the spread of fire from one room or area of a building to another. The Internet is a volatile and unsafe environment when viewed from a computer-security perspective, therefore "firewall" is an excellent metaphor for network security.
It can allow or disallow traffic according to very specific rules, for instance permitting some commands to a server but not others, limiting file access to certain types, varying rules according to authenticated users and so forth. This type of firewall may also perform very detailed logging of traffic and monitoring of events on the host system, and can often be instructed to sound alarms or notify an operator under defined conditions.
SightSpeed requires a default route to the Internet. If your organization only allows proxied connections, SightSpeed will not work correctly.If you organization allows all outbound traffic, then you do not need to further configure your firewall.If your organization filters outbound traffic based upon type, then you can do any of the following: Filter based on Source Port:Add a rule which allows outgoing UDP traffic Destination Port=Any) from source ports 9000 through 9005 on your internal network to the Internet. Filter based on Source IP:Add a rule which allows outgoing UDP traffic (Destination Port=Any) from source IP or computer that is using SightSpeed to the internet