To better unterstand the situation we'd need the following....
- network diagram with IPs
- screenshot of the ping test so we'd see what you ping and the result
If you connect the AP could you see anything in the controller log.
Here a example how it should look like - the last message that you should see is the "blacklist sent"
So what do you see in the log?
![64fb9c07cfc84fbaa8f2a383f55f0541_RackMultipart20160831-94406-16dojg2-APconnect_inline.png 64fb9c07cfc84fbaa8f2a383f55f0541_RackMultipart20160831-94406-16dojg2-APconnect_inline.png](/t5/image/serverpage/image-id/4665iFB30266E4DC26B8F/image-size/large?v=v2&px=999)