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17 maart 2026 in
CTech Metrology, Luc Wens

Fixing Ubiquiti UniFi Devices

This guide describes the steps taken to restore a Ubiquiti UniFi network after switching the ISP cable modem from Telenet to Orange. The procedure covers re-adopting a factory-reset US-8-60W switch via SSH and securing the new Orange modem.

Why the UniFi Devices Go Offline After a Modem Swap

When you replace your ISP modem, the new device takes over as the DHCP server and assigns new IP addresses. Your UniFi switch and access points remember the old IP address of the UniFi Controller. Because they can no longer reach the controller at that address, they enter a "Click to Resolve" (offline) state.

An additional symptom can be that one or more access points receive an IP address on a different subnet (e.g. 192.168.70.x instead of 192.168.0.x), caused by a subnet conflict with the new modem.

Step 1: Factory Reset the Offline Switch (US-8-60W)


  1. In the UniFi dashboard the only available action was Remove — the controller could no longer communicate with the switch at all.
  2. Click Remove to clear the ghost entry from the controller.
  3. While the switch is still powered on, use a paperclip to press and hold the physical reset button for approximately 10 seconds until the LEDs flash.
  4. Wait 1–2 minutes for the switch to reboot. It will now have factory-default credentials.

Step 2: Find the Switch's New IP Address via the Orange Modem

  1. Open a browser and navigate to http://192.168.0.1 to access the Orange modem admin interface.
  2. Password: printed on the sticker on the bottom/back of the modem — look for Admin Key or Modem Password. Do not use the Wi-Fi password.
  3. Go to the connected devices / DHCP clients list. Look for a device named ubnt or similar. In this case the switch received the same IP as before: 192.168.0.185.

Step 3: SSH into the Switch and Point It to the Controller

After a factory reset the switch reverts to default SSH credentials: username ubnt, password ubnt.

The UniFi Controller runs on the Dell PC at 192.168.0.17.

On Windows: open Command Prompt or PowerShell

ssh ubnt@192.168.0.185
  • If prompted with a fingerprint warning, type yes and press Enter.
  • Enter password: ubnt (nothing will appear on screen while typing — this is normal).

Once logged in (prompt shows US-8-60W#), run:

set-inform http://192.168.0.17:8080/inform

Within seconds the switch appears in the UniFi dashboard as Pending Adoption. Click Adopt.

Pro tip — run the command a second time

After the switch shows Connected or Provisioning in the dashboard, run the set-inform command once more in the terminal. This forces the device to permanently save the controller address so it survives a power outage.

set-inform http://192.168.0.17:8080/inform

Step 4: Fix the Windows Firewall (if the switch does not appear)

When Windows connects to the Orange modem for the first time, it may classify it as a Public network. This causes Windows Firewall to block port 8080, which the switch uses to contact the controller.

Change the network profile from Public to Private in Windows network settings, or manually allow port 8080 through Windows Firewall. After doing this, the switch will be discovered immediately.

Step 5: Assign a Static IP to the Controller PC in the Orange Modem

Because the entire UniFi network depends on the controller's IP address (192.168.0.17), it must never change. If the Orange modem reboots and reassigns a different IP to the Dell PC, all devices will lose the controller again.

  1. Log into the Orange modem at http://192.168.0.1.
  2. Navigate to the connected devices / DHCP settings.
  3. Find the DELL PC in the list (currently on DHCP).
  4. Click the pencil/edit icon on the right and change its IP assignment from DHCP to Static / Fixed IP, keeping the address 192.168.0.17.
  5. Save. Expect a brief network interruption while the modem applies the change.

Step 6: Change the Orange Modem Admin Password

Immediately after setup, change the default modem admin password to a strong personal password.

  1. Log into http://192.168.0.1 with the current password from the sticker.
  2. Navigate to the password change page.
  3. Current Password: the Access Key printed on the modem sticker.
  4. New Password requirements: minimum 8 characters, at least one uppercase letter, one lowercase letter, one digit, and one special character (e.g. !, @, #).
  5. Enter the new password twice and click Save.

Important: store the new password in a safe place (password manager). If you forget it, the only recovery option is a full factory reset of the Orange modem, which also erases the static IP reservation you just configured.

End Result

After completing these steps the full UniFi network was restored:

  • US-8-60W switch: Connected / Up to date
  • U6-Mesh: Connected / Up to date
  • U6-Extender: Connected / Up to date
  • U6-Living: Connected / Up to date
  • AC-LR: Connected / Up to date (correct IP restored to 192.168.0.100)

The controller PC (192.168.0.17) is now statically reserved in the Orange modem, ensuring the setup survives any future modem restart or firmware update.



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