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UNIFI ADOPTION FAILED, HOW TO RESOLVE

January 23, 2020 February 6, 2021

Chances are you may come across an issue with your Ubiquiti UniFi configuration.
If you’re making changes to your network/UniFi controller, then you may come
across an error saying that UniFi adoption failed. This is mostly due to changes
made(e.g. changing IP subnet) which prevents your UniFi device(s) from phoning
home to the controller.

In order to resolve this particular issue, you will need to reset your UniFi
device first. The reset button is usually located right next to the ethernet
port of your UniFi hardware, and requires a needle-sized tool to press and hold
until it lights up again. This will factory reset the device so that it can be
re-provisioned.

Once done, open up your UniFi controller and head over to “Devices”. You should
see your UniFi device listed with the “adoption failed” error displayed. Click
on it to open the properties window.





You will now see a + sign to the very right. Click on it to bring up the
adoption section. Make sure the Inform host address is your controller’s IP
address. If the Port is blank, go ahead and type in 22 for the port. In most
cases, the default user and password for UniFi devices are either ubnt/ubnt or
root/ubnt. In my case root for the user and ubnt as the password worked.

Once you’re done, go ahead and click to adopt. Your UniFi device will utilize
SSH in order to download configuration information from your controller such as
your SSID(s) and security configuration.

Your device should now be working. If not, head over to your controller’s
Settings->Controller.

Make sure your Controller Hostname/IP is set to the IP address of your UniFi
controller. Click the box next to Override inform host with controller
hostname/IP to check/enable it. After, click Apply Changes. Go ahead and adopt
it once more.

Note: If your UniFi Controller is running remotely on the internet, you will
need to allow TCP port 8080 and UDP port 3478 on your server/network firewall
for adoption to work properly.

You can also adopt your UniFi device through SSH. Look here for more
information.

Happy Ubiquiting!


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