Cisco WLC Debug AP not joining

This topic is to discuss the following lesson:

Hi Rene,
I have an issue with an AP not joining the WLC, I have 3 AP’s on the WLC, one of them keeps drop the connection, when I check it by show cdp nei deta it has the correct IP address and it’s up on the switch, I can bring it back up by bouncing the port but it will come up for less than 3 minutes or so, please check the debug below on the WLC.
Note: the IP address and MAC address is hidden for privacy purposes.
Thanks in advance

Cisco Controller) >*spamReceiveTask: Jul 26 15:25:07.135: XX:XX:XX:XX:XX:XX Msg Timeout for, max retries: 5 (Cisco Controller) >*spamReceiveTask: Jul 26 15:28:18.559: XX:XX:XX:XX:XX:XX Echo Timer Expiry: Missing Echo from AP XX:XX:XX:XX:XX:XX, Closing dtls Connection. *spamReceiveTask: Jul 26 15:28:18.560: XX:XX:XX:XX:XX:XX Incorrect message is being sent to AP :10:10:10:10 (XXXXX) by Controller: !@.12.12.12 (XXXX) Not posting onto message queue *spamReceiveTask: Jul 26 15:28:18.560: XX:XX:XX:XX:XX:XX Unable to delete all station message to *spamReceiveTask: Jul 26 15:29:28.624: YY:YY:YY:YY:YY:YY DTLS connection was closed

Hello Wisam

The first thing to do is to determine if the problem is in your network infrastructure or your AP. Try swapping the malfunctioning AP with one that is functioning correctly and see if you have similar behaviour.

If the same AP malfunctions again, then the problem is with the AP. If the new AP malfunctions, then the problem is the infrastructure.

Secondly, once you find out where the problem is, there are several things you can do:

If the problem is the AP, try bringing it up to the latest stable firmware version as some bugs have been found with several older versions.

If the problem is with the network, check the following:

  1. Check STP that convergence is taking place and that it is stable
  2. check to see that there is no power or cable issue. Take a look at this Cisco support forms thread for more details.
  3. Try changing the port of the switch that you are using. It could always be a bad port…

Try these out and let us know your results so we can see if we can help you further.

I hope this helps!


Looking at this output, it seems a connectivity issue between the WLC and AP.