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wlc 2504 APs not joining time is correct


My APs are not joining the controller all of a sudden. The APs used to work fine but after a reboot ALL of them are not joining. 

I set the date and time manually and set a NTP server and rebooted, but still have the same issue. I can ping the APs.

Under Statistics -> ap join, I select the AP. Under discovery phase stats, it shows last successful attempt with a recent time, and last unsuccessful attemp is blank. There are no errors, all blank

One funny thing I notice when i run  Show Sysinfo is this line:

OUI File Last Update Time........................ Sun Sep 07 10:44:07 IST 2014

Does anyone have any ideas?

15 Replies 15

Rich R
VIP Advisor VIP Advisor
VIP Advisor

Resetting time to the past (temporarily) is simply to allow the APs to join as if the certs had not expired yet - so they can download new software and config from the WLC.
The config is done as global config on the WLC only.  The WLC will update every AP which joins with that config - but only after they have been updated to the new software which supports that config.

TAC recommended codes for AireOS WLC's
Best Practices for AireOS WLC's
TAC recommended codes for 9800 WLC's
Best Practices for 9800 WLC's
Cisco Wireless compatibility matrix
Field Notice: FN-72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Recommended
WARNING - see CSCwd37092 Throughput degraded after upgrading to code - 2800/3800/4800 series
- The fix for CSCwd37092 is now released in and
- For IOS-XE 17.3.6 select controller model, go to IOS XE Software AP Service Pack, select CSCwd40096 17.3.6 APSP2
Field Notice: FN-63942 Lightweight APs and WLCs Fail to Create CAPWAP Connections Due to Certificate
                      Expiration - Software Upgrade Recommended
Field Notice: FN-72524 - During Software Upgrade/Downgrade IOS APs Might Remain in Downloading State
                     After 4 Dec 2022 Due to Certificate Expiration - Fixed in and 17.3.6 APSP5 (APSP_CSCwd83653)
                     Also fixed in (8.5 mainline) and (8.5 IRCM) if you can't upgrade to 8.10
                     Note that and have been deferred (withdrawn) and are effectively unsupported by Cisco
Richard R
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