C9120 AP Not Joining C9800-L-F-K9 WLC (DTLS Handshake Expired)

[viraj patil]

Hello Team,

we have replaced 90 access points till now and they connected as well with WLC. But for 02 access points, it's giving the error of "DTLS Handshake expired". Please help to resolve this issue.

WLC Model = C9800-L-F-K9

AP Model = C9120AXE & C9120AXI

WLC Version = 17.3.6

[balaji.bandi]

Hope i take this as new AP ?

Can you do Factory reset and try to re-join

Also connect console cable and post complete boot logs here to understand the issue ?

what Version of AP - is some mode of the AP shipping later 2022 (i dont remember) need new code 17.9.4a on WLC ( also suggest to upgrade to new code on WLC is advised all the time for better bug fixes)

check some filed notice :

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

https://www.cisco.com/c/en/us/support/docs/field-notices/724/fn72424.html

[marce1000]

              - Go for  17.9.4a  = recommended release ,

 M.

[Scott Fella]

Here is a nice guide to help with ap's not joining issues:

https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/218396-troubleshoot-catalyst-9800-ap-join-or-di.html

[Rich R]

If the APs have old version of software installed they might not be able to join to the WLC.

As others have said upgrade WLC to TAC recommended version as per the link below.

You might also need to upgrade the AP software manually before it can join - for 17.3.6 that would be 15.3(3)JPJ9:
https://software.cisco.com/download/home/286322988/type/286288051/release/15.3.3-JPJ9