3Com OfficeConnect 3CR856-95, User Manual

Page: 47 / 96

47
VPN connections to other networks are unaffected by settings in
PC Privileges. To allow or deny VPN connections to other
networks see
“Configuring VPN” on page 50 .
Special Applications
Select Special Applications tab to display the Authorized
Application setup screen. See Figure 43 below.
Figure 43 Special Applications Screen
Some software applications need a connection to be started from
the Internet — an act that is usually blocked by the Gateway’s
firewall.
So that these special applications can work properly and are not
blocked, the firewall needs to be told about them. In each
instance there will be an outgoing trigger which tells the
Gateway’s firewall that the application has started and to allow
the incoming connections.
Each defined Special Application only supports a single computer
user and any incoming ports opened by a Special Application
trigger will be closed after 20 minutes of inactivity for TCP/IP
connections or 10 for UDP/IP connections.
For each special application configured by the Gateway, a row is
added to the table. Each row contains the following items:
■
Delete button — Deletes the special application on that row.
This will prevent the Gateway’s firewall from opening to that
connection.
■
Name — Each special application is named. This name is not
used by the Gateway and is only to enable you to identify the
connection. Clicking the name of a connection displays the
Special Application Setup screen. See “Adding and Editing
Special Applications” below.
■
Trigger Port — This is the TCP/IP port number that the
Gateway uses to recognise that the application has started.
Additionally there are three buttons outside the table:
■
Help — displays the online help page for this screen.
■
New — creates a new special application. See “Adding and
Editing Special Applications” below.
Adding and Editing Special Applications
1 Click on the New button to create a new special application or
on the name of a special application to edit the settings for that
application.
dua08569-5aaa01.book Page 47 Wednesday, March 13, 2002 10:39 AM