Issue resolved. Thank you for the prompt response, TK.
We have a client running a Balance 380 as the AP Controller for 4x AP One.
It’s been running smoothly for months, but since this morning, no traffic passes on the Wi-Fi.
A device connects, receives and IP, but no traffic passes.
If we connect the same same via cable to the LAN, it runs smoothly.
Apple device connects and works without issue.
Standard troubleshooting all checked and rechecked.
If you can assist, it would be much appreciated.