How to troubleshoot and fix a network switch or unmanaged switch that is not providing connectivity to wired devices

Summary

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

Common Causes

When a network switch stops providing connectivity to your wired devices, the issue usually comes down to power, cabling, or the devices connected to the switch. This guide will walk you through the most common causes and how to resolve them, starting with the quickest checks before moving into more detailed troubleshooting.

If your devices connect to the network via Wi-Fi rather than Ethernet, you may also want to review our guide on How to connect to Wi-Fi.

Quick Fix Steps

Before diving into detailed diagnostics, try these steps first. They resolve the majority of switch connectivity issues.

1. Confirm the switch is powered on. Check that the power LED on the switch is illuminated and the power cable is firmly seated at both ends.
2. Power cycle the switch. Turn the switch off, wait 30 seconds, then turn it back on. Allow two minutes for it to fully initialise before testing.
3. Check the Ethernet cables. Ensure each cable is firmly clicked into place at both the switch port and the device end. Swap any suspect cables with a known working one.
4. Verify the link lights. Each connected port should show a solid or blinking link LED. No light usually means a cable, port, or device issue.
5. Test a different port. Move the cable to another port on the switch to rule out a faulty port.
6. Restart the connected device. Reboot the computer, printer, or other device that has lost connectivity.

Detailed Troubleshooting

If the quick fixes did not restore connectivity, work through the following sections in order.

Check the Power Supply and Environment

• Confirm the power outlet is working by plugging in another device, such as a lamp.
• If the switch uses an external power adapter, check that the adapter is the correct model and that the LED on the adapter (if present) is on.
• Ensure the switch is in a well-ventilated area. Overheating can cause intermittent failures or shutdowns.
• Check that the switch has not been accidentally switched off at a power board or wall switch.

Inspect Cables and Connections

• Look for visible damage on Ethernet cables, including kinks, crushed sections, or damaged connectors.
• Use Cat5e or Cat6 cables for Gigabit connections. Older Cat5 cables may not support higher speeds reliably.
• Confirm the cable run length does not exceed 100 metres, which is the maximum for standard Ethernet.
• Try a different cable that you know is working, especially if the link light is off on a particular port.

Test the Connected Devices

To determine whether the issue lies with the switch or with a specific device:

1. Connect a laptop directly to the suspect switch port using a known-good Ethernet cable.
2. On Windows, open Settings > Network & internet > Ethernet and confirm the connection shows as active.
3. On macOS, open System Settings > Network > Ethernet and check that the status reads Connected with a green indicator.
4. If the laptop connects successfully, the original device or its cable is likely at fault.
5. If the laptop also fails to connect, the switch port or the switch itself is the problem.

Check the Upstream Connection

An unmanaged switch relies on an upstream router or modem to provide network and internet access. If the switch is powered and link lights are on but devices still cannot reach the internet:

• Confirm the router or modem supplying the switch is powered on and operating normally.
• Check the Ethernet cable running from the router to the switch. Swap it if possible.
• Reboot the router or modem by turning it off, waiting 30 seconds, and turning it back on.
• Test connectivity from a device connected directly to the router to confirm the router itself is providing internet.

Look for Signs of Hardware Failure

• No link lights on any port despite known-good cables and devices.
• Unusual behaviour such as ports working intermittently or devices dropping off the network randomly.
• Strange odours, excessive heat, or audible buzzing from the switch.
• The switch powers off on its own or fails to power on at all.

When to Replace the Switch

Unmanaged switches are generally reliable but do have a finite lifespan. Consider replacement if:

• Multiple ports have stopped working despite trying different cables and devices.
• The switch frequently drops connections or requires regular reboots.
• The unit is more than five to seven years old and has shown signs of instability.
• You need additional features such as VLANs, traffic prioritisation, or remote management, which require a managed switch.

When purchasing a replacement, match or exceed the speed of your existing one (for example, Gigabit) and ensure it has enough ports for current devices plus room for future growth.

Getting Further Help

If you have worked through this guide and your switch is still not providing connectivity, our support team can assist further. Please have the following information ready when you reach out:

• The make and model of the switch.
• How many devices are affected and what types (computers, printers, phones, and so on).
• What you have already tried, including any cables or ports you have swapped.
• Whether the switch has any link lights active at all.

You can Open a Ticket through our support portal and we will help you get back online.

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