Firewall Settings for Microsoft Live Messenger
Leave it to Microsoft to provide one of the most complex (in terms of its communications)
messaging applications available. Live Messenger can be configured to work
through a firewall, as shown in Figure 19-2, but that is all you have available to configure
to get it to work. If you find that you need to configure your firewall to allow
Live Messenger to make outbound connections or accept inbound connections, with
all of the ports used by all of the available features, you??™ll be pretty busy.
Figure 19-1
Yahoo Messenger will
accommodate proxy
server and firewall
connections to the
Internet.
Firewall Configurations for IM and Voice over IP 129
The text chat feature prefers TCP port 1863, but is known to function on ports
80, 443, 1493, 1542, and 1963. The file transfer/sharing feature uses TCP ports 1544
and 6891. Remote Assistance uses TCP port 3389. Audio chat uses TCP ports 1556,
11771, and 13803 as well as UDP ports 5004??“65535. The Remote Desktop and whiteboard
features use TCP ports 389, 522, 1503, 1720, and 1731. Launching games uses
TCP port 80. The video conference feature uses TCP ports 9000??“9999 and UDP ports
5004??“65535. Signing in uses TCP port 443.
Firewall Settings for Skype
Skype (see Figure 19-3) is one of the most popular stand-alone VoIP programs and
provides a good example of the typical network configuration for making Internet
and normal phone calls from your computer.
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