How to Troubleshoot LightBurn Failing to Connect to the Laser Engraver via Wi-Fi

If LightBurn cannot connect to your laser engraver over Wi-Fi, the problem is usually related to the network settings, IP address, port configuration, or your computer. This guide walks you through the most common checks to help identify the cause and restore the Wi-Fi connection.

1. Check the Network Connection

First, make sure your computer and the laser engraver are connected to the same network. They must either use the engraver's Wi-Fi (LongerLaser_XXXX) or be connected to the same local Wi-Fi network.

If the devices are on different networks, LightBurn will not be able to communicate with the machine.

2. Check if the IP Address Is Correct

Connect the laser engraver to your computer using a USB cable. Open the Console in LightBurn and enter the following command:

Check the returned information. Make sure the machine's IP address matches the IP address configured in Ethernet/TCP mode in LightBurn.

3. Check the Port Number

Verify that the port number is set to 8847. An incorrect port number can prevent LightBurn from connecting to the laser engraver.

4. Check Whether Telnet Is Enabled

On Windows, open:

• Control Panel → Programs → Turn Windows features on or off
• Enable Telnet Client.

Restart your computer. Then try connecting to the laser engraver through Wi-Fi again.

5. Try Another Connection Method

If the problem continues and the cause is still unknown:

• Try connecting to the laser engraver over Wi-Fi using LaserGRBL.
• Or try connecting from a different computer.

This can help determine whether the issue is related to the software or the computer.

Final Thoughts

Most LightBurn Wi-Fi connection problems are caused by incorrect network settings, IP addresses, port numbers, or computer configuration. Check each item step by step until the connection is restored.

If the problem persists after completing these checks, try another computer or test the connection with LaserGRBL to help identify the source of the issue.