Some Disconnected AP with the last seen date but some is not.

[roy_wu_7880766]

I am managed around 1k zf7372 AP in my zd5000 controller. i found that some of AP is disconnected with last seen date but some is not. Anyone know the problem?

[karl_lavender]

If there is no "last seen" date, then the AP has either never connected to the controller, or maybe you've made firmware/backup changes since the AP was down.