14.7. Firewall Configuration
window is similar to the screen in the installation program and the
Security Level Configuration Tool
Figure 14.10. Firewall Configuration
is selected, the system allows complete access to any active services and ports. No connections to the system are refused or denied.
configures the system to reject incoming connections that are not in response to outbound requests, such as DNS replies or DHCP requests. If access to services running on this machine is required, you can choose to allow specific services through the firewall.
Only devices configured in the
section are listed as available
. Connections from any devices selected in the list are accepted by the system. For example, if
only receives connections from internal system, you might want to allow connections from it.
If a service is selected in the
list, connections for the service are accepted and processed by the system.
text field, list any additional ports that should be opened for remote access. Use the following format:
. For example, to allow IMAP access through the firewall, specify
. Numeric ports can also be specified explicitly; to allow UDP packets on port 1234 through the firewall, enter
. To specify multiple ports, separate them with commas.