General Troubleshooting
Here are my suggestions for handling a few common problems that could affect your ability to connect to a remote computer.
Firewall blocks access
Firewalls are the enemy of many network services: they're trying to prevent precisely what you want to achieve. If you have a firewall installed on your computer (including Leopard's built-in firewall), or one built into your router or gateway, you may need to change its settings to ensure that you aren't accidentally blocking remote access.
See Use Manual Port Mapping, (p. 73), in Configure Your Router or Gateway, for the ports that need to be "unblocked" to use Back to My Mac and iChat's various file, audio, video, and screen-sharing services, as well as direct screen sharing and ...
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