Update: Ultimate Links - Basic Network Troubleshooting

If a computer is unable to connect to a network or see other computers on a network, it may be necessary to troubleshoot the network.

A network may not work because of any of the below reasons.

1. Network card not connected properly.
2. Bad network card drivers or software settings
3. Firewall preventing computers from seeing each other
4. Connection Problem
5. Bad network hardware

Because of the large variety of network configurations, operating systems, setup, etc... not all of the below information may apply to your network or operating system. If your computer is connected to a company or large network, or you are not the administrator of the network, it is recommended that if you are unable to resolve your issues after following the below recommendations that you contact the network administrator or company representative.

Note: If you are being prompted for a Network password and do not know the password, Service providers are able to assist users with obtaining a new or finding out the old password.

Verify connections / LEDs

Verify that the network cable is properly connected to the back of the computer. In addition, when checking the connection of the network cable, ensure that the LEDs on the network are properly illuminated. For example, a network card with a solid green LED or light usually indicates that the card is either connected or receiving a signal. Note: generally, when the green light is flashing, this is an indication of data being sent or received.

If, however, the card does not have any lights or has orange or red lights, it is possible that either the card is bad, the card is not connected properly, or that the card is not receiving a signal from the network.

If you are on a small or local network and have the capability...

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