You can use Network Diagnostics to help solve Internet connection problems. If you can't connect to the Internet using, Network Diagnostics opens and walks you through solving the connection problem.

If Network Diagnostics can't resolve the problem, there may be problems with the Internet service provider (ISP) you are trying to connect to, with an external device you are using to connect to your ISP, or with the server you are trying to access.

If your Internet connection is working properly, but you are trying to connect to the Internet using a different network port configuration, use Network Diagnostics to investigate your network settings. Click "Assist me" in the Network pane of System Preferences, then click Diagnostics to open Network Diagnostics and follow the onscreen instructions. You can also check the Network pane of System Preferences for your network port settings.

To set up a new network port configuration, click "Assist me" in the Network pane of System Preferences and then click Assistant. The Network Setup Assistant opens and helps you configure a new network port.

You can use Network Diagnostics to diagnose problems related to your Built-in Ethernet, AirPort, or internal or external modem connections. If you are trying to connect to the Internet by another method, see the documentation that came with your Internet account.

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