UPD. 

Finally, the solution that helped me was migrating to Ubuntu.

1. I prepared a backup (Global view > Settings > Maintenance > Backup > Save to local file)

2. Made a fresh installation of a Ubuntu 20.04 + Omada Controller Linux version

3. Chose this file as a source while configuring a new controller.

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I'm trying to add an EAP225(EU) access point to my network, and it fails with a generic error. 

On the Devices page of my Controller I click "Adopt", I get prompted for the Site, select one, then click Adopt, and nothing happens with a 'General error'.

I tried to adopt the AP unconfigured (just out of the box) with original software (most likely 1.0.1), configured, with the software upgraded to 1.1.3, 1.2.1, with Cloud-based controller management off and on: the error persists.


Tried to get more info via browser console, but it's just a POST request with a `{"mac": "AC-15-A2-4A-3F-1E"}` payload, and 200 response `{"errorCode":-1,"msg":"General error."}`
POST https://192.168.0.111:8043/73cf70fb99bc57429f629c4c4b0297dc/api/v2/sites/63d80e0b452bac2ab5b398bc/cmd/devices/adopt

Software Controller

v5.13.22 running on Windows 10.

Router 
Model: ER605 v2.0
Firmware Version: 2.2.3 Build 20231201 Rel.32918

AP
Model: EAP225(EU) v5.0

Firmware Version: 1.2.1 Build 20230824 Rel. 61490

I've double-checked for the needed ports and they seem to be open, plus I've added the rules to the firewall to ensure that that's not the cause