How to Fix a Brother Printer Showing Offline in Linux Mint After a Router Change

A router change should be a simple upgrade, but it often breaks printing overnight. Your Brother printer worked fine yesterday, and today Linux Mint says it is offline, paused, or unreachable. The printer itself may show a ready light, which makes the problem even more confusing.

In most cases the printer is not broken at all. The new router gave it a different IP address, a different network name, or different security settings. Linux Mint is still trying to talk to the old address. This guide walks you through finding the printer again, fixing the connection in CUPS, and setting a fixed address so the same problem does not return next time.

Quick Answer

Print a network report from your Brother printer to find its new IP address after the router change. In Linux Mint, open Printers, delete or edit the old printer entry, and add it again using the new IP address with an AppSocket or IPP connection. Then set a static IP or a DHCP reservation in your router so the address never changes again.

Why a Router Change Takes Your Printer Offline

When you replace a router, several things change at once, even if you keep the same Wi-Fi name and password.

The Printer Gets a New IP Address

Your old router may have given the printer an address like 192.168.0.15. Many new routers use a different range, such as 192.168.1.x or 10.0.0.x. Mint still has the old address saved in the printer queue. Every print job goes to an address where nothing is listening, so CUPS marks the printer as offline or unreachable.

The Network Name or Security Changed

If the new router uses WPA3 only or a guest network, the printer may not reconnect. Many Brother models only support 2.4 GHz Wi-Fi and WPA2, and fail silently on 5 GHz-only or WPA3-only settings.

mDNS and Discovery Behave Differently

Linux Mint finds many printers automatically using mDNS. Some new routers block multicast traffic between bands or devices. Automatic discovery then fails, even though the printer works fine if you type its address manually.

Step 1: Check the Printer and Print a Network Report

Start at the printer, not at the computer. You need one fact before anything else: the address the printer has right now.

1. Make sure the printer is powered on, has paper, and shows no error lights for toner, paper jams, or an open cover.
2. On models with a screen, go to Menu > Print Reports > Network Config and print the page.
3. On models without a screen, hold the Go or Wi-Fi button as described in your manual until the network page prints.
4. On the printed page, find the IP Address, SSID, and Connection or WLAN status lines.
5. Confirm the SSID matches your new router’s network name exactly.

If the IP address shows 0.0.0.0 or 169.254.x.x, the printer is not connected. Reconnect it to Wi-Fi using the setup wizard, choosing your 2.4 GHz network. A normal address in your computer’s range means the problem is on the Mint side.

Your computer and printer should share the same first three groups of numbers, for example both starting with 192.168.1.

Step 2: Test the Connection From Linux Mint

Before changing any settings, test whether Mint can reach the printer at its new address.

1. Open a terminal from the Mint menu or with Ctrl+Alt+T.
2. Ping the printer using the address from the network report, for example ping -c 4 192.168.1.45.
3. Check that the printer’s web page opens by typing that same address into your browser.
4. Make sure the Avahi discovery service is running with systemctl status avahi-daemon.

If the ping works and the web page opens, your network is fine and you only need to fix the printer queue. If the ping fails, check that your computer is not on a guest network, turn off any VPN for the test, and confirm both devices are on the same router. A detailed walkthrough in our guide to finding a printer IP address on your network can help if the address keeps hiding from you.

Step 3: Fix the Existing Printer Queue

Sometimes you can repair the old queue instead of starting over. This works when only the address changed.

1. Open the Mint menu and launch Printers.
2. Right-click your Brother printer and check that Enabled is ticked. An unticked queue is a very common cause of an offline message.
3. If jobs are stuck, open the queue and cancel all pending documents.
4. Right-click again, open Properties, and look at the Device URI field.
5. If the URI contains the old IP address, replace just the address part with the new one and click Apply.
6. Print a test page from the Properties window.

From the terminal, lpstat -p -d lists status and lpstat -v shows each queue’s URI. If the test page prints, still do Step 5 so the fix lasts.

Step 4: Remove and Re-Add the Printer With the New Address

If editing the URI does not help, a clean re-add is faster than more guessing. Removing a queue does not uninstall the Brother driver.

1. In Printers, right-click the old Brother entry and choose Delete.
2. Click Add, then expand Network Printer.
3. If your printer appears automatically with the correct new address, select it and finish the wizard.
4. If it does not appear, choose AppSocket/HP JetDirect, enter the new IP address, and leave the port as 9100.
5. When asked for a driver, search for your exact Brother model, or choose the driverless IPP option if offered.
6. Give the printer a clear name, print a test page, and confirm the page comes out.

For most modern Brother models, Mint’s built-in driverless printing works well. The Brother support and driver download page confirms whether your model needs Brother’s Linux driver package instead.

Step 5: Give the Printer a Fixed Address

This is the step that stops the problem from coming back. You have two good options, and the router reservation is the easier one.

Option A: DHCP Reservation in the Router

1. Log in to your new router’s admin page, usually at 192.168.1.1 or 192.168.0.1.
2. Find the DHCP or LAN settings and look for Address Reservation or Static Leases.
3. Find your printer in the connected devices list. Its MAC address is also printed on the network report.
4. Reserve its current IP address for that MAC address and save the settings.

Option B: Static IP on the Printer

On the printer panel or its web page, set the Boot Method to Static and enter an address outside the router’s DHCP range, plus the correct gateway and DNS from the network report.

After setting a fixed address, restart both the printer and the CUPS service with sudo systemctl restart cups, then print one more test page to confirm everything still works.

Step 6: Fix Wi-Fi Band and Security Problems

If the printer keeps dropping off the new network entirely, look at the router’s wireless settings.

• Use 2.4 GHz: Give the 2.4 GHz band its own name if band steering keeps pushing the printer to 5 GHz.
• Use WPA2 or WPA2/WPA3 mixed mode: Avoid WPA3-only mode for older Brother models.
• Turn off AP isolation: Guest networks often block devices from seeing each other.
• Move the printer closer: A weak signal causes random offline reports even when settings are correct. Check the signal value on the network report.

Common Mistakes to Avoid

• Reinstalling drivers first: The driver rarely breaks because of a router change. Fix the address first.
• Adding three copies of the printer: Multiple half-working queues confuse apps. Keep one working queue and delete the extras.
• Ignoring the Enabled tick: After errors, CUPS sometimes disables a queue. Always check it before deeper fixes.
• Setting a static IP inside the DHCP pool: Another device can be given the same address later, causing a conflict.
• Testing only from one app: Print a system test page first. If that works but one app fails, the problem is in that app.

Conclusion

A Brother printer showing offline in Linux Mint after a router change is almost always an address or Wi-Fi problem, not a dead printer. Print the network report, confirm the new IP address, repair or re-add the queue with that address, and then reserve the address in your router. Once the address is fixed, Mint and the printer keep finding each other, even after restarts and future router reboots.

Frequently Asked Questions

Why does my printer work from my phone but not from Linux Mint?

Your phone discovered the printer again automatically using its new address. Mint is still using the old saved queue with the old address. Edit the Device URI or re-add the printer with the new IP address.

Should I use the Brother driver or driverless printing?

Try driverless IPP first on modern models, as it is simpler and updates with the system. Use Brother’s Linux driver package if you need special features like certain fax or scanning functions on older models.

What port should I use when adding the printer manually?

Use port 9100 with an AppSocket connection and the printer’s IP address. This is the standard raw printing port on Brother network printers and works reliably in Mint.

How do I restart printing services in Mint?

Run sudo systemctl restart cups and sudo systemctl restart avahi-daemon in a terminal. Then check the printer status again with lpstat -p.

Will a factory reset of the printer help?

Only use it as a last resort if the printer refuses to join the new network at all. You will need to set up Wi-Fi, the address, and all custom settings again from scratch.