Multiple random issues with Windows tablet being disconnected from WiFi on multiple AP.

[jmroy]

Hi community, this is my first post.

Context :

In our company, we have a lift. There is a Windows tablet bolt on that lift. The driver of the lift goes to multiple places in the company, crossing 4-5 AccessPoint.

The APs are set in neighbor, and we see in logs when the client is being sent to a neighbor AP.

• APs are 5x AP121 on 6.5r8.172694
• WMM is activated

Problem :

There is a problem where the Windows tablet is being disconected from the network, like there were a roaming problem, or something. He only disconnect and reconnect the Wifi adapter and the network is coming back OK.

Logs :

When i monitor the MACADDR of the tablet, we see multiple problems.Just note that we do not have a problem where the tablet is NEVER able to connect. Disabling the wifi interface and reenabling it make it works though.

I will put a log file in attached.

Here are some highlights :

Error 1 : 4 way Handshake failure

06/11/2018 09:50:41 AM 80000B98F7E7 F09CE91673D4 INF2911   BASIC  (2)Sta(at if=wifi0.1) is de-authenticated because of 4way handshake failure

06/11/2018 09:50:41 AM 80000B98F7E7 F09CE91673D4 INF2911   INFO  (3)Tx disassoc (reason 2 <prior-auth-invalid>, pwr 11dBm)

06/11/2018 09:50:41 AM 80000B98F7E7 F09CE91673D4 INF2911   BASIC  (4)Sta(at if=wifi0.1) is de-authenticated because of notification of driver

Error 2: ?

06/11/2018 10:15:13 AM 80000B98F7E7 F09CE91673D4 INF2911   INFO  (333)Rx deauth (reason 1 <unspecified>, rssi 36dB)

06/11/2018 10:15:13 AM 80000B98F7E7 F09CE91673D4 INF2911   BASIC  (334)Sta(at if=wifi0.1) is de-authenticated because of notification of driver

Error 3 ?

06/11/2018 12:15:09 PM 80000B98F7E7 F09CE91673D4 INF2911   INFO  (1718)Rx deauth (reason 1 <unspecified>, rssi 32dB)

06/11/2018 12:15:09 PM 80000B98F7E7 F09CE91673D4 INF2911   BASIC  (1719)Sta(at if=wifi0.1) is de-authenticated because of notification of driver

Error 4 ?

06/11/2018 12:46:25 PM 80000B98F7E7 F09CE91673D4 INF2911   INFO  (1938)Rx deauth (reason 1 <unspecified>, rssi 23dB)

06/11/2018 12:46:25 PM 80000B98F7E7 F09CE91673E8 INF2911   DETAIL (1939)Rx <specific> probe req (rssi -69dB)

TESTS :

• When doing a survey, i see at least 2-3 AP (with the same SSID) everywhere, for the Roaming. So there is no zone where there is no Wifi.

• When i go with a laptop, i can go from one side to another side of the company with a ping -t without being disconnected from the Wifi.

Problem may be a roaming problem ? (since when i disconect and reconnect the Wifi, i am successfully being reconnect to the nearest AP)

Problem may be a channel problem ? (set automaticly).

Thank you for your help !

[jmroy]

You can move this case to a Support Case then .

Best regards,

[dsouri]

Hi @Jean-Marie Roy​ ,

Please also know, at anytime we can move this over to a Support Case as I see the Domain your email belongs do has Select Level Support.

Happy to assist further, I am in Central Time so at the time of this post it is 9h16 AM

David Souri

HiveCommunity Moderator

[jmroy]

Hi David,

Thank you for the quick reply.

When i was testing with the laptop, yes i was walking like 10 meter, and was stopping to let my wifi adapter the time to understand changement. I went everywhere in the shop, this way.

For the casing of the tablet, i will get a photo in a couple of hours, before the diner (it is 8h52 AM in here). I will let you know.

Plus, i have someone who is taking notes to know where and at what hours a wifi problem occured. I will be able to compare with the client monitor logs of the tablet to know what happened to these hours.

I will take time to read the link you sent me so i can verify what is up relating to the interference.

Will be back with more infos !

[dsouri · Accepted solution]

Hello,

When moving around with a laptop, are you holding the laptop and walking?

Could you describe the Casing/Harness the Tablet is in? Could you upload a photo?

To start troubleshooting, the first things we would look at is the RF environment and either identify or rule-out an issue.

This guide explains the steps and defines the data points you would look for:

https://thehivecommunity.aerohive.com/s/article/Radio-Frequency-Interference-NG

Happy to help,

David Souri

HiveCommunity Moderator