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The first thing you need to do is to check the line quality of your phone, your phone cables and outlet. Then you have to check the connection between your computer and the outlet. You can also disconnect the cable several times and then connect it back to make sure that the cable is firmly inserted. You have to be sure that the cable is not chewed or cut or has other damages.
If your computer frequently disconnects from the Internet, the first thing you need to check is the following option: Disconnect if idle fro__. If this option is enabled it means that after a period of inactivity, your computer will automatically disconnect from the Internet. If you want to change this option you have to open System Preferences and click on the Network option. After that you have to choose Internal Modem option and then click on the PPP tab and select option.
After you did this doesn’t work, you can also ask your Internet service provider if they have a disconnecting policy and they automatically disconnect you if they see a period of inactivity. If you still have Internet problems on your MacBook you can use the Network Diagnostics to help you find a solution. You have to go into System Preferences, click on the Network option and select the Assist me option. After that you have to follow the instructions and if you see that Network Diagnostics will help you.
If you can’t connect to your Internet service provider using the Point to Point Protocol over Ethernet (PPPoE), you have to make sure that have the correct information in Network preferences. If you have a wireless Internet connection and you have some problems with it, you have to be sure that you configured properly the base station according to the software and the instruction manual which came with your wireless router. You also have to check the signal strength and if the signal is low this could mean that you are too far from the router and you should try to reposition the device to have a better signal.
If you have a good connection to the Internet, but some pages are not able to load and you see messages like: “The specified server could not be found”, “The server could not be found” or “Connection attempt failed”, you can try to reset your router or your computer and you can also use the Network Diagnostics to see if the problem is solved.