Hi @BjornPython, You should be able to administer this from Accounts in the global view.

@Wayne110, you may need to unplug the cable from port 1 and power cycle it to force it to start up with the fallback IP.

Hi @Dr_Marty, It seems you already narrowed the issue down to switch port 9. You may need to replace the switch, but here's some other things to consider... Verify that all the fans are working...

Hi @Wayne110, If you have physical access, you should be able to directly attach a host to the controller to access it. Just manually set the hosts interface to a unique address in the same subnet...

Hi @Hoser7632, You will need a few things... An sfp+ rj45 transceiver: The SM5310-T from TP-Link should work, but there are other brands that are compatable. Power supplied directly to the AP's DC...

Hi @lukass2000, Not sure if it will help any, but you can up-vote this: https://community.tp-link.com/en/business/threads/topic/828620