Issue with AP AIR-CAP1532I-E-K9

[tanner.zaitt]

Hello Cisco Community.

I have an issue with one Access Point.

The technical information about the AP is:
Product ID AIR-CAP1532I-E-K9
Version ID V01
Serial Number FCZ1752H01T
Entity Name Cisco AP
Entity Description Cisco Wireless Access Point
Certificate Type Manufacture Installed
FlexConnect Mode supported

The version of the IOS image is:
 8.0.152.0

The WLC controller is:
Manufacturer's Name.............................. Cisco Systems Inc.
Product Name..................................... Cisco Controller
Product Version.................................. 8.0.152.0
Bootloader Version............................... 1.0.1
Field Recovery Image Version..................... 6.0.182.0
Firmware Version................................. FPGA 1.3, Env 1.6, USB console 1.27
Build Type....................................... DATA + WPS

System Name......................................WC2
System Location..................................
System Contact...................................
System ObjectID.................................. 1.3.6.1.4.1.9.1.1069
Redundancy Mode.................................. Disabled
IP Address....................................... 192.168.1.100
IPv6 Address..................................... ::
Last Reset....................................... Power on reset
System Up Time................................... 139 days 5 hrs 14 mins 10 secs
System Timezone Location......................... (GMT +2:00) Jerusalem
System Stats Realtime Interval................... 5
System Stats Normal Interval..................... 180

Configured Country............................... BG - Bulgaria

--More-- or (q)uit
Operating Environment............................ Commercial (0 to 40 C)
Internal Temp Alarm Limits....................... 0 to 65 C
Internal Temperature............................. +38 C
External Temperature............................. +25 C
Fan Status....................................... OK

State of 802.11b Network......................... Enabled
State of 802.11a Network......................... Enabled
Number of WLANs.................................. 9
Number of Active Clients......................... 36

Burned-in MAC Address............................ 58:EF:ED:8E:5E:00
Power Supply 1................................... Present, OK
Power Supply 2................................... Absent
Maximum number of APs supported.................. 500
System Nas-Id....................................
WLC MIC Certificate Types........................ SHA1

The issue is that the client ET56 WINDOWS ENTERPRISE TABLET with Windows 10 sometimes not able to connect to SSID of the AP. This happens too often.

Could you please guide me how to do troubleshooting?
From where I can start and what I should to check?


On the WLC controller on the Tech Support on the AP Crash Log I noticed that the AP with which I have an issue is exist there.
The crash log is here:
https://drive.google.com/file/d/1MRUM5ZSNhusV6cduMKrDAxERgJkd9nq_/view?usp=sharing

I am not sure it's related to the issue.

In the current moment the client is connected.

Thank you in advance.

[PabMar]

Hello tanner.zaitt,

What model of WLC is that?

Also, AireOS 8.0 is quite old. Have you considered upgrading that to a more recent version? The most current is 8.10 but you can see the recommended versions here.

Regards,

Pablo.

[tanner.zaitt]

Hi, PabMar.

WLC 5508.

It's old hardware, also I have here too much AP's that not supported on the newer versions of WLC images.
This is the reason why I don't upgrade them.

Soon these AP's and WLC controllers will be decommissioned.

For now, I can try to do a few things:

1 Turn off and turn on the tablet and try again to connect to the wifi.
2 (Cisco Controller) debug>client a8:6d:aa:1d:19:24
https://cway.cisco.com/wireless-debug-analyzer/

3 Move the AP to the second controller.

4 Restart the AP ( from the previous experience I could confirm restarting the AP solve the issue to the next time).

[Rich R]

I think that's all you can do with that old code version

[tanner.zaitt]

---

@Rich R wrote:

I think that's all you can do with that old code version

---

Hi Rich, I remember you from my another topic.

And there you shared with me this setting:

"Do you have the same tcp-adjust-mss setting on both WLC?  Try 1250? (This is something where I've specifically seen Android behave differently to iPhone and Windows previously)"

Do you believe that this could help ?

But for Windows 10 devices what is the best value?

[Rich R]

Hi @tanner.zaitt there's no harm done in enabling tcp-adjust-mss 1250 so it's worth a try anyway.
We have it set like that on all our WLCs (Cisco recommended) which was fortunate because that was the workaround for the throughput bug which emerged in 8.10.181.0 recently.
That said, it doesn't sound like it will help in this case, in my opinion.