Hello It could be a bunch of things. The most common issue, If you have 2 controllers configured in High Availability if the AP has failed over to the foreign controller the local controller will display this way. It is also possible if it is an AP with external Antennas that the antennas have not been selected within the GUI. Also if there are no WLAN services assigned to the radios that will cause it as well. What is the admin status of these radios? Are they admin on? What happens if you drop down the channel box and chose auto? Does it then pick a new channel and turn on? Does the AP show and up-time value in the AP availability report?