WLC always flooding on page "AP Join Statistics"

[Ethan and Mia]

Hi all

My cisco wlc 5520

always flooding like picture below , when I cleared it , It back again and again

summary access point 250

but all access point still working normally

What wrong ?  Thank for advance..

[Leo Laohoo]

There is an AP that is unable to join the controller. 
Find that AP and check the status (maybe needs a reboot) or disable the port.

[marce1000]

      - Also check the controller's logs , perhaps you will find additional info's

 M.

[Ethan and Mia]

Hi all , The wlc logging as attached file

Is it seems access point can't get IPv6 from dhcp server ?

Could you please suggest 

Thank you 

[Scott Fella]

Are you using ipv6? As long as the ap gets an ipv4 address it should be fine. You might want to try to test the cabling, replace the patch cable and move it to another switch port. Another way is just to swap the ap with another one that is working and see what happens.

[Ethan and Mia · Accepted solution]

Problem was solve , Time zone between WLC and APs was different 

Thank you all for assistance 

[chris-doro]

I had the same problem.
It stopped after I disabled IPv6.
Controller - General - Global IPv6 Config -> DISABLED