3Com OFFICE CONNECT CABLE/DSL SECURE GATEWAY 3CR856-95 User Manual

Contents

50So that these special applications can work properly and are notblocked, the firewall needs to be told about them. In eachinstance there will be an outgoing trigger which tells theGateway’s firewall that the application has started and to allowthe incoming connections.Each defined Special Application only supports a single computeruser and any incoming ports opened by a Special Applicationtrigger will be closed after 20 minutes of inactivity for TCP/IPconnections or 10 for UDP/IP connections.For each special application configured by the Gateway, a row isadded 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 thatconnection.■ Name — Each special application is named. This name is notused by the Gateway and is only to enable you to identify theconnection. Clicking the name of a connection displays theSpecial Application Setup screen. See “Adding and EditingSpecial Applications” below.■ Trigger Port — This is the TCP/IP port number that theGateway uses to recognize that the application has started.Additionally there are two buttons outside the table:■ Help — displays the online help page for this screen.■ New — creates a new special application. See “Adding andEditing Special Applications” below.Adding and Editing Special Applications1 Click on the New button to create a new special application oron the name of a special application to edit the settings for thatapplication.Figure 48 Special Application Settings Screen2 Select the applications from the Choose Application drop-downbox. See Figure 48. If the application you want to define is not inthe list select Custom and see “Creating Custom SpecialApplications” below.3 Click Add to add the special application to the list of protocols orClose to abort your selection and return to the SpecialApplications screen.Depending on the settings you have made in PC Privileges theSpecial Application you have defined may not be allowed acrossthe Firewall. See “PC Privileges” on page 47.Creating Custom Special ApplicationsIf your special application is not listed in the Choose Applicationdrop-down box you can still configure it manually. Select Customfrom the Choose Application drop-down box and the SpecialApplication Setup Screen gains the extra fields needed todescribe a custom special application. These are shown inFigure 49 below.dua08 569-5aaa02.bo o k Pag e 50 Thursday , No vem ber 7 , 2002 3:09 PM