@Vincent-TP Hi, My problem with mesh config is solved by support team. Flashed fixed firmware they provided and 5ghz works now.

Hi @Vincent-TP So I changed setting “None” to “external device” no difference My config for each VLAN dhcp pool address=192.168.10.1/24 interface=MAIN network=192.168.10.0 address=192.168.20.1/24...

Is it possible if signal from uplink device is weak lets say -66dBm than downlink device refusing clients on 5ghz network (mesh backhaul) ?

Hi @Vincent-TP yes I tested already 5ghz SSID without vlan tag also with no encryption same result. I rebooted controller yesterday (i am not sure if it has some impact ... or maybe that fw upgrade...

I did factory reset readopted device upgraded to 1.3.50 fw .... still no change ... 5ghz refusing clients in a second I cant find any problem with config ... the only thing that possibly can be issue...

Controller Version 6.1.0.19 running in docker devices WLAN config VLANs EAP783 connected to switch port 1 all vlans tagged 10,20,30,50,100 No issue on eap783 2,4ghz 5ghz 6ghz correct vlans/ips...