topic Re: Aironet 1830 APs suddendly stopped joining WLC - DTLS Teardown in Wireless

Aironet 1830 APs suddendly stopped joining WLC - DTLS Teardown

ManuFe — Tue, 27 Sep 2022 09:03:46 GMT

Hello there,

hope you can help me with this. I have a little site with a WLC and 3 Aironet 1830 APs that suddendly, all together, stopped the join with the local WLC. Everything worked right and we had no firmware/image update of any kind.

They worked for a couple years and now it's impossible to get the APs to join.

The APs cycle through the green, orange and red lights.

I've already checked the license, the ntp, the image version, the country settings and it all seems fine. I've tried some commands, reset of an AP, disable check on mic, manual setting of ntp and nothing changes. Moreover it should be all fine since they worked for two years, there are not new APs I've added to the network.

All the APs were configured with in local mode with static settings (capwap ap commands). I've resetted one in two ways with the mode button and the capwap ap erase all. It just got back online with informations from the WLC but still no luck.

All the APs terminate the connection with the message DTLS Teardown, the connection is closed by the WLC.

The WLC can correctly see the APs, ping them. Even if I erase them they just reappears in the AP list on the page.

In the attachments you can find some logs from the console (ap resetted and in dhcp mode and the WLC - some show commands, debug and boot sequence) and some screenshots from WLC gui.

What else can I try?

Most of the messages from the APs are like this:

CAPWAP State: Discovery
Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
Discovery Response from 10.0.10.4
CAPWAP State: DTLS Setup
dtls_disconnect: ERROR shutting down dtls connection ...
CAPWAP State: DTLS Teardown

Thank you in advance!

Re: Aironet 1830 APs suddendly stopped joining WLC - DTLS Teardown

Mark Elsen — Tue, 27 Sep 2022 11:54:32 GMT

- Reboot the WLC , check if that can help.

Re: Aironet 1830 APs suddendly stopped joining WLC - DTLS Teardown

patoberli — Tue, 27 Sep 2022 12:28:16 GMT

You might be affected by this: https://www.cisco.com/c/en/us/support/docs/field-notices/639/fn63942.html

If you are affected by this, then the solution is: first upgrade the WLC to the latest 8.3 release, or if you only use 1830 APs, to the latest 8.5. Then you can enable the cert expiry ignore feature as per the field notice.

Re: Aironet 1830 APs suddendly stopped joining WLC - DTLS Teardown

ManuFe — Tue, 27 Sep 2022 12:47:13 GMT

Already rebooted. I've tried to switch the license to the evaluation one with no success. Then back to the base ap count... Same story. Rebooted both times.

Re: Aironet 1830 APs suddendly stopped joining WLC - DTLS Teardown

ManuFe — Tue, 27 Sep 2022 12:54:10 GMT

I can surely try but there is no message about a certification expiration! I will try to upgrade the WLC to the 8.5 release then.

Actually I have 8.3 on the WLC.