How to troubleshoot a network switch that is not providing connectivity to wired devices

Summary

This guide helps you troubleshoot and resolve: How to troubleshoot a network switch that is not providing connectivity to wired devices. Follow the steps below to fix the issue.

Common Causes

A network switch connects multiple wired devices—such as desktop computers, printers, and VoIP phones—to your local network. When a switch stops providing connectivity, affected devices may show limited or no network access, even if Wi-Fi remains operational. This guide walks you through the most common causes and how to resolve them.

Quick Fix Steps

1. Restart the network switch by unplugging its power cable, waiting 30 seconds, and plugging it back in.
2. Check that all Ethernet cables are firmly seated in both the switch and the connected device.
3. Verify the switch power LED is illuminated. If no lights are on, try a different power outlet.
4. Test the affected device with a different Ethernet cable and a different port on the switch.
5. Restart the wired device that is experiencing connectivity issues.

Detailed Instructions

Inspect switch port activity lights

Most switches feature LED indicators next to each port that show link status and activity. A solid light typically indicates a stable connection, while a blinking light indicates data transfer. If a port light is completely off, the switch is not detecting a connection from that device.

1. Locate the port where the affected device is connected.
2. Check whether the corresponding LED is on or blinking.
3. If the light is off, unplug the Ethernet cable and reconnect it firmly.
4. If the light remains off, move the cable to a different port on the switch.

Check for switch overload or loop

Connecting multiple switches together in a loop, or daisy-chaining too many devices, can cause network storms that interrupt connectivity for everyone.

1. Inspect how your switches are connected. Ensure there is only one Ethernet cable running between any two switches.
2. If you recently added a new switch or cable, disconnect it temporarily to see if connectivity returns to other devices.
3. Avoid plugging both ends of a single Ethernet cable into ports on the same switch.

Verify upstream connection

The switch relies on an upstream connection to your router or modem for internet access. If that uplink fails, wired devices may have local network connectivity but no internet.

1. Identify the Ethernet cable connecting your switch to your router or NBN connection device.
2. Ensure it is plugged into a LAN port on the router, not the WAN or internet port.
3. Check the router’s indicator lights to confirm it is online.
4. If the router appears offline, restart the router before troubleshooting the switch further.

Troubleshooting Specific Devices

Windows

1. Select Start > Settings > Network & internet > Ethernet.
2. Confirm the connection status shows as connected. If it shows Unidentified network or No internet, the switch or upstream connection may be at fault.
3. Select Network reset only as a last resort, as this will remove all network adapters and reset networking components to default settings.

macOS

1. Select the Apple menu > System Settings > Network.
2. Select Ethernet from the list of interfaces.
3. Check that the status reads Connected. If it shows Self-Assigned IP, the device is not receiving a valid address from the network.
4. Select TCP/IP > Renew DHCP Lease to request a new address.

Test with Wi-Fi as a comparison

If you are unsure whether the issue is isolated to wired connectivity, try connecting a laptop or smartphone to your Wi-Fi network. For help setting up a wireless connection, see How to connect to Wi-Fi. If Wi-Fi works but wired devices do not, the issue is likely with the switch, cabling, or the specific wired device.

If you have completed these steps and wired devices still cannot connect, Open a Ticket with 220 Internet Services support.

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