User`s guide

AT&T Global Network Client User’s Guide
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Appendix B: Third-Party Firewall Support
The AT&T Global Network Client program uses Internet Protocol to communicate with other computers
on the network just like other network programs (such as web browsers and e-mail programs). Third-
party personal firewalls can prohibit certain types of network communication. Running multiple firewalls
on users’ PCs can cause difficulties and is not supported by AT&T.
Some firewalls must be configured to allow the AT&T Global Network Client to communicate with the
network in order for client features to function properly. The table below lists the required changes.
Feature Protocol:
Port
Dial
Authentication
TCP:5053
Disconnect
Warning
UDP:7000
Software
Updates
TCP:20,21
SLA Data
Collection,
Configuration
Settings
HTTP/TCP:80
Figure 97: AT&T Global Network Client Firewall Configuration Table
Dial Authentication
The AT&T Global Network Client uses a proprietary enhanced authentication process using TCP port
5053.
Disconnect warning
The AT&T Global Network Client communicates with the dialed gateway after connecting using UDP port
7000 to be notified of pending disconnects. Disconnect time limits are configured in the AT&T
Administration Server. If the connection is idle for the specified amount of time a datagram is sent from
the gateway to the AT&T Global Network Client and the AT&T Global Network Client displays a warning
that the connection will be disconnected in 1 minute unless the user takes the appropriate action.
Maximum inactivity timeouts are set in the AT&T Configuration Server at the account level. The AT&T
gateways will timeout inactive connections regardless of the AT&T Global Network Client used. The
warning will only be displayed if the AT&T Global Network Client is allowed to communicate on UDP port
7000.
This is not a critical feature, but it is recommended.