Check the Network preferences
If you are having trouble with your Internet connection (that is, connecting to the Internet, not email issues), check your Network preferences. One particular feature to check is the “Network Port Configurations.” Also see pages 263–265.
1. |  Open the System Preferences: single-click its icon in the Dock. |
2. | In the System Preferences pane, single-click the “Network” icon (it's in the third row). |
3. | From the “Show” menu, choose “Network Port Configurations.” |
4. | In the list of “Port Configurations,” make sure there are no checkmarks in connections you don't use. |
5. | Also make sure that your primary connection is at the ... |
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