topic Re: Mobility Express randomly dropping clients in Wireless

Mobility Express randomly dropping clients

emanuel32804 — Mon, 27 Oct 2025 22:42:12 GMT

Hello,

I'm facing an issue with our APs dropping clients for some reason. I've examined the logs and I can see it going in a cycle of removing and adding users. We are experiencing this on a range of devices including Android phones and Windows laptops. Currently using ME version 8.10.196.0. The issue only seems to occur with radius users, the other WLAN that uses regular WPA2 doesn't seem to face the same issue. We are currently using 3802 APs in our network.

Here's the log I keep seeing:

2025-10-27 18:24:32	Local0.Info	192.168.100.2	Cisco-7488.bbb7.fe80: *apfReceiveTask: Oct 27 18:24:31.208: %LOG-6-Q_IND: apf_ms_radius_override.c:213 Radius overrides disabled, ignoring source 4 
2025-10-27 18:24:32	Local0.Info	192.168.100.2	Cisco-7488.bbb7.fe80: *apfReceiveTask: Oct 27 18:24:31.208: %APF-6-USER_NAME_DELETED: apf_ms.c:8805 Username entry (xxxxxxxx) is deleted for mobile xx:xx:xx:xx:xx:xx 
2025-10-27 18:24:32	Local0.Warning	192.168.100.2	Cisco-7488.bbb7.fe80: *spamApTask0: Oct 27 18:24:31.232: %APF-4-MOBILESTATION_NOT_FOUND: apf_api.c:57734 Could not find the mobile xx:xx:xx:xx:xx:xx in internal database
2025-10-27 18:24:33	Local0.Info	192.168.100.2	Cisco-7488.bbb7.fe80: *Dot1x_NW_MsgTask_0: Oct 27 18:24:32.948: %APF-6-RADIUS_OVERRIDE_DISABLED: apf_ms_radius_override.c:213 Radius overrides disabled, ignoring source 4 
2025-10-27 18:24:33	Local0.Info	192.168.100.2	Cisco-7488.bbb7.fe80: *Dot1x_NW_MsgTask_0: Oct 27 18:24:32.948: %APF-6-RADIUS_OVERRIDE_DISABLED: apf_ms_radius_override.c:213 Radius overrides disabled, ignoring source 2 
2025-10-27 18:24:33	Local0.Info	192.168.100.2	Cisco-7488.bbb7.fe80: *Dot1x_NW_MsgTask_0: Oct 27 18:24:32.948: %APF-6-USER_NAME_CREATED: apf_ms.c:9003 Username entry (xxxxxxxx) with length (253) created for mobile xx:xx:xx:xx:xx:xx 
2025-10-27 18:24:33	Local0.Info	192.168.100.2	Cisco-7488.bbb7.fe80: *Dot1x_NW_MsgTask_0: Oct 27 18:24:32.948: %APF-6-RADIUS_OVERRIDE_DISABLED: apf_ms_radius_override.c:213 Radius overrides disabled, ignoring source 4 
2025-10-27 18:24:33	Local0.Warning	192.168.100.2	Cisco-7488.bbb7.fe80: *apfReceiveTask: Oct 27 18:24:32.972: %OSAPI-4-MUTEX_LOCK_FAILED: osapi_sem.c:1362 Failed to acquire a mutual exclusion object. waitforever: mutex lock operation failed. errcode = Resource deadlock avoided
2025-10-27 18:24:33	Local0.Notice	192.168.100.2	Cisco-7488.bbb7.fe80: *apfReceiveTask: Oct 27 18:24:32.972: %OSAPI-5-MUTEX_UNLOCK_FAILED: osapi_sem.c:1253 Failed to release a mutual exclusion object. mutex unlock failed, not owned by the calling thread. errcode = Operation not permitted

Does anyone have any idea what could be causing this?

Thanks,

Emanuel

Re: Mobility Express randomly dropping clients

Kasun Bandara — Tue, 28 Oct 2025 01:20:06 GMT

Hi @emanuel32804 as a tart, you can use this tool to upload and analyze the debug logs to get clear understanding about the issue.

Wireless Debug Analyzer

Re: Mobility Express randomly dropping clients

emanuel32804 — Tue, 28 Oct 2025 03:09:38 GMT

I just get error try again later when I upload my tech_support.tgz to that. It also does not work if I just upload the log text file. Am I uploading the wrong things?

Re: Mobility Express randomly dropping clients

Mark Elsen — Tue, 28 Oct 2025 07:50:59 GMT

- @emanuel32804 Uploading the logfile (cleartext) should work, what error do you get ?
As far as the original problem is concerned : reboot the AP that the client is using
and check if that can help.

Re: Mobility Express randomly dropping clients

emanuel32804 — Wed, 05 Nov 2025 06:17:42 GMT

The error I get is "Error Try again"

Restarting the AP also did not help the issue.

Re: Mobility Express randomly dropping clients

Mark Elsen — Wed, 05 Nov 2025 06:25:25 GMT

- @emanuel32804 Attach the file which you tried to upload ,

Re: Mobility Express randomly dropping clients

emanuel32804 — Wed, 05 Nov 2025 06:33:26 GMT

Here is the 2 files I tried.

Re: Mobility Express randomly dropping clients

Mark Elsen — Wed, 05 Nov 2025 06:51:16 GMT

- @emanuel32804 Those aren't outputs from client debugs needed for Wireless Debug Analyzer

Execute client debugging according to
https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/213258-collect-debugs-from-wireless-lan-control.html

Re: Mobility Express randomly dropping clients

emanuel32804 — Wed, 05 Nov 2025 07:29:06 GMT

Ok that was much more successful. Attached the log. In the log analyzer, it gets all the way through EAP authentication and DHCP, and it goes into RUN state. Then luckily (for debugging) about 4 seconds later it dropped it, which shows

Nov 05 02:18:54.519 *apfReceiveTask Client session has timed out Nov 05 02:18:54.519 *apfReceiveTask Client disassociation event has occured. Possible reasons may be due to AP Radio Reset usually due to channel change or wlan was manually disabled or Client unable to get valid DHCP IP for WLAN using DHCP required Nov 05 02:18:54.519 *apfReceiveTask Client has been deauthenticated Nov 05 02:18:54.520 *apfReceiveTask Client session has timed out

Re: Mobility Express randomly dropping clients

Mark Elsen — Wed, 05 Nov 2025 07:44:00 GMT

- @emanuel32804 Validate the configuration of the mobility express based controller using :
WirelessAnalyzer input (procedure) for AireOs controllers

Feed the result into Wireless Config Analyzer

Re: Mobility Express randomly dropping clients

emanuel32804 — Wed, 05 Nov 2025 08:04:59 GMT

See attached for the results. The analyzer didn't have anything that really jumped out at me as being related to this issue, but it's very possible I don't know what I'm looking for.

I did also see these in the debug logs, they seem to state the issue more specifically:

Nov 05 02:18:54.519 *osapiBsnTimer Authentication session timer expired: mark mobile for immediate deletion Nov 05 02:18:54.519 *osapiBsnTimer apfMsSessionExpireCallback (apf_ms.c:762) Expiring Mobile! Nov 05 02:18:54.519 *apfReceiveTask apfMsExpireMobileStation (apf_ms.c:8148) Changing state for mobile 46:f4:73:a3:72:77 on AP a0:93:51:c8:e4:40 from Associated to Disassociated

What could cause that timeout?

Re: Mobility Express randomly dropping clients

Mark Elsen — Wed, 05 Nov 2025 09:07:19 GMT

- @emanuel32804 Disable 802.11v for the SSID and check if that can help ,

Re: Mobility Express randomly dropping clients

emanuel32804 — Thu, 06 Nov 2025 18:02:30 GMT

That worked! Client has been on network for 10 hours with no disconnects! Thank you