Ubiquiti UniFi Error Code 'Adopt Failed: SSH Error': How to Fix It

Q: Why does my UniFi AP keep showing SSH adoption errors?

SSH adoption errors typically occur when the AP has custom credentials that don't match the controller's settings, or when there are network connectivity issues. Factory resetting the AP usually resolves credential mismatches.

Q: What are the default SSH credentials for UniFi devices?

The default SSH username is 'ubnt' and the default password is 'ubnt'. These credentials are reset when you perform a factory reset on the device.

Q: Can I adopt UniFi devices across different subnets?

Yes, but you need to use Layer 3 adoption by manually specifying the controller's IP address via SSH command: set-inform http://[controller-ip]:8080/inform

Q: How long should UniFi device adoption take?

Normal adoption takes 2-5 minutes. If it takes longer than 10 minutes or fails repeatedly, there's likely a network connectivity or credential issue that needs troubleshooting.

Q: What if my UniFi AP won't reset to factory defaults?

Try holding the reset button for 30 seconds instead of 10-15. If that fails, the device may need TFTP recovery or have hardware issues requiring replacement.

Abstract

The 'Adopt failed: SSH error' message appears when your UniFi Controller cannot establish a secure connection to adopt a new access point. This typically happens when the AP has custom SSH credentials that don't match the controller's default settings, or when network connectivity issues prevent proper communication.