Almost two months ago I created a network bridge (br0) in TrueNAS (that is on IP address 10.0.0.50) to test it with some virtual machines I had installed there. The bridge had a MAC address 0E-AC-CC-XX-XX-XX.

Then after deletion of the VMs and deletion of the bridge the bridge still shows up in Clients until right now in Omada, with the same IP address as the TrueNAS server (10.0.0.50). It also reports to have a direct connection with the Router in the column AP/PORT, what's also very strange, because my TrueNAS server is connected to a switch. Omada is also reporting that: Switch Attic Port 3.

I cannot delete the 'ghost' client at all, if I forget it, it pops up a second later and if I want to block it, I get the message: "This device is installed with the controller and cannot be blocked."

When I restart the TrueNAS server, nothing happens with the ghost client, and it shows an uptime of 39 days so far, pretty much the same time I started to create the network bridge in TrueNAS. I run the Omada Controller (version 6.0.0.25 Stable) on a Raspberry Pi 4B. It also happened on a previous Omada version and restarting all devices (router/switches/APs and Raspberry Pi with Omada itself) did not help.

Is this a bug or something? How can I delete this?

Other hardware (all integrated in Omada):

Router: ER707-M2

Switches (x2): SG2008P

APs (x3): EAP650