Hi  @Eg64 

What kind of controller are you using? Is the controller on the same site as the ER8411's?

If the controller is on the local site as the ER8411's, you need to check the controller's Internet access, and the connection between the controller and the SDN devices.

If the controller is at a remote site as the ER8411's, you should focus on the ER8411's Internet access.

  @Vincent-TP 

Thanks, Vincent, will test when on-site.

My OMADA environment is enabled by a software controller, most recent official version, and runs on a Windows server.

Controller is not located at the site of the devices showing the "being adopted" message.

Other internet-based services run on the remote site perform well and are reachable from outside.

Hi  @Eg64 

Before you go to the site, please check the controller's site; we need to make sure the gateway router on the controller's site has opened port 29810-29816.