AP C9115AXI-A does not want to join a WLC C9800-L-F-K9

[BPHY11]

Hi guys!

I have an AP model C9115AXI-A and I want to join it to a WLC C9800-L-F-K9, but it cannot be registered.
I have already pinged from the WLC to the AP and vice versa, at the time of doing so, I get a response in both ways, I have exhausted all my possible responses. Does anyone have an idea what is happening?
I would appreciate it very much.

[Flavio Miranda]

Hi

 There are a few steps on the WLC you need while joinning APs.  Recommend you this guide. If you followed alteady and did not succeed try to share more information on the WLC side.

https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/213911-understand-catalyst-9800-wireless-contro.html#anc34 

[BPHY11]

Hi!

Yes, I already followed the corresponding steps in a CISCO guide and it still doesn't want to register the AP.

Greetings.

[Scott Fella]

Take a look at the console output from the ap.  that should show you why the ap is not joining.

[BPHY11]

Hi, 

I did, but it doesn't show anything unusual

[Scott Fella]

Attach the output to a text file so we can see it.  Make sure you capture about 5 minutes from when the ap is rebooted.

[BPHY11]

Sure, only that at the moment I am not on site, since the client called us again until Friday

[Haydn Andrews]

What version are you running on the 9800

There could be potential you are hitting this issue:

https://www.cisco.com/c/en/us/support/docs/field-notices/639/fn63942.html 

[BPHY11]

The version that the WLC has is 17.03.04! 

[Scott Fella]

Console into the ap, reboot the ap and capture the output.

[BPHY11]

Yes that's how it is

[Scott Fella]

You have any other ap's joined or is this a new setup?

[BPHY11]

It is a new configuration, in fact all the equipment is new.

[Leo Laohoo]

What firmware is the 9800 running on?

Console into the AP and reboot.  Post the entire boot-up process (of the AP).

[BPHY11]

Claro, solo que de momento no estoy en el sitio, ya que el cliente nos volvió a llamar hasta el viernes