It is when things do not work that you have to find out what
your applications and services need and dig into your firewalls and open things up.
Firewall Settings for Yahoo Messenger, Webcam, and Voice Services
Yahoo Messenger text messaging automatically uses TCP port 5050, but can function
on port 80 or 443. The webcam sharing feature uses TCP port 5100. Yahoo Voice Chat
uses TCP or UDP ports 5000??“5010. Yahoo Voice service uses TCP ports 20, 23, 25, 80,
119, 5050, 8001, and 8002.
The Yahoo Messenger client does not allow you to change any of these settings
to work around proxy server or firewall restrictions, but it does allow you to change
its configuration to suit a proxy server (common in most corporate networks) or
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128 Project 19
firewall??”see Figure 19-1. To access the Yahoo Messenger Preferences window, choose
Messenger | Preferences | Connection.
If Yahoo Messenger does not work, your options are to configure proxy server
settings if you know there is a proxy server between your computers and the Internet
(mostly at work, rarely at home) or configure your firewall to allow access for the
ports needed.
Firewall Settings for AIM
AIM??™s settings are about as simple as you can get: it offers no network configuration
settings??”it simply figures out the best port to use on its own. It works well through
proxy servers and firewalls, preferring to use TCP ports 5190??“5193, but basic text
messaging is also known to use ports 23 and 80 in a pinch.
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