UniFi - UAP stuck in adopting state

Problem


After beginning adoption, the UAP remains in “adopting” state for long period, without success. In some cases, the UAP appears as "adoption failed" in the controller.

Possible causes / recommended actions


  • Software Firewall / Anti-virus prevents communication between controller-UAP.

    1. Disable Firewall (e.g., Windows Firewall) when testing connectivity between controller & UAPs.
    2. Assuming UAPs appear online, adjust the Firewall / AV settings to allow incoming/outgoing connections for UniFi controller (including ports).
  • UAP is unable to reach the UniFi controller.

    1. Wait up to 30 seconds and refresh the controller page
    2. If the UAP is still “adopting”, make sure AP has access to Internet (e.g., SSH into the AP and ping unifi, it should come back right away, even if it fails)
    3. Assuming AP can ping the gateway, use a PC on the same network as the UAP and go through the Wizard, using default username/password and write down its IP address
    4. Install latest version of UniFi and go through the wizard steps, using ubnt/ubnt as admin's username/password connect UniFi APs and laptop (with controller installed) to the same router
    5. Check the router and write down the IPs of the AP (can be found under DHCP client table of router)
    6. SSH into each problematic AP and issue 'syswrapper.sh restore-default'
  • UAP continues with default IP of 192.168.1.20—issue with DHCP server.

    1. Make sure that the DHCP server is active (router in network performing function)
    2. If router is leasing DHCP address to UAP, try ping/SSH again (UAP may be faulty)
    3. From the controller, make sure AP does obtain the IP from DHCP, note the IP from Controller PC, SSH into the AP (using the IP, default username/password is ubnt/ubnt) tail -f /var/log/messages copy and send the text output to support@ubnt.com

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