Many network connection issues are caused by problems with the cables or firewall settings. Use the following checklist to solve these problems with home networks:
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Check all of the network cables and wires. A loose or disconnected cable or wire prevents a network connection and Internet access. Check the following connections:
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Network cable from the modem to the network hub (or router).
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Network cable from the network hub to the RJ-45 network port on the computer.
Figure : Shape of RJ-45 connector
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Network cable between two computers.
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Check the lights on the network hub. The lights can often show the location of a connection problem.
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If you are trying to connect to another computer on the network, make sure that computer is turned on.
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Check the firewall settings on all the computers on the network. The firewall settings may be preventing network access.
After performing the items in the checklist, try to connect to the network.
If you do not experience problems with the network, you are done.
If you are still experiencing problems with the network, continue with the next step to use the Network and Sharing Center.