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Re: Tablet refuses to connect to an AP that it knows

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On 2026-09-08 10:51, Nuno Silva wrote:
> On 2026-09-08, Carlos E.R. wrote:
> 
>> On 2026-09-08 03:50, Maria Sophia wrote:
>>> Carlos E.R. wrote:
>>
>>
>>> The interesting clues are that the Linux machines and Motorola phones
>>> connect normally, another identical Lenovo tablet has the same problem, and
>>> forgetting the WiFi network and adding it again fixes the problem.
>>>
>>> Since you just factory reset the router, I would check the WiFi security
>>> settings. In particular, see whether it is now using WPA2/WPA3 mixed mode
>>> instead of WPA2-Personal/AES, whether WPA3 is enabled, or whether
>>> PMF/802.11w is set to required.
>>
>> That's an interesting idea.
>>
>> The security is at default settings, WPA2-PSK-AES, and is greyed
>> out. To change it, I have to get into the advanced setting pages. The
>> page in question is not familiar, I did not touch those settings
>> previously.
>>
>> Alternatives are
>>
>>    Open/EnhancedOpen Open&OWE - warning: disables easy mesh
>>    EnhancedOpen Open&OWE - warning: disables easy mesh
>>    WPA2/WPA3 PSK&SAE - warning: not all repeaters/extender are compatible
>>    WPA3 SAE - Warning: make sure your devices support it.
>>
>> The only one I might have been tempted to try of those is the third
>> one. I enabled it now, the tablet is still complaining.
>>
>>
>> No, I don't worry about it at all, I'm just curious, because it is a
>> nuisance to have to reenter the credentials.
>>
>>
>> My guess is that the BSSID changed, but the router config doesn't
>> report it. It is mentioned somewhere as MAC, though
>>
>> Ah, found it, for 2.4Ghz. It is not the same as reported by my Linux
>> laptop in that room, there is one digit difference. Not configurable.
>>
>> Ah, there is one for 2.4G and another for 5G, they differ in the last
>> digit. It matches the laptop info for 5GHz, I did not know that old
>> laptop had the 5Gh band.
>>
>>
>> Bingo! It changed. This command finds the change:
>>
>> Legolas:~ # grep "wlan1: authenticate with" /var/log/messages
>>
>>
>> <0.6> 2026-09-07 12:05:12 Legolas kernel - - - [ T1159] wlan1:
>> authenticate with 70:8b:... (local address=a0:d3:7a:...)
>> <0.6> 2026-09-07 12:26:22 Legolas kernel - - - [ T1159] wlan1:
>> authenticate with 90:d3:... (local address=a0:d3:7a:...)
>>
>>
>> So, one more tidbit for you: my router changes the BSSID on factory
>> reset, so it can not be tracked across different owners. :-)
> 
> Any chance it has a setting to offer separate WLANs on 5 GHz and 2.4
> GHz, and that this setting now is set to show two "separate" APs?

No, they are paired by default, same settings on both, if the setting 
exists. They can be separated, but I prefer paired.

-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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Tablet refuses to connect to an AP that it knows "Carlos E.R." <robin_listas@es.invalid> - 2026-09-07 19:42 +0200
  Re: Tablet refuses to connect to an AP that it knows Maria Sophia <mariasophia@comprehension.com> - 2026-09-08 04:50 +0300
    Re: Tablet refuses to connect to an AP that it knows "Carlos E.R." <robin_listas@es.invalid> - 2026-09-08 09:41 +0200
      Re: Tablet refuses to connect to an AP that it knows Nuno Silva <nunojsilva@invalid.invalid> - 2026-09-08 09:51 +0100
        Re: Tablet refuses to connect to an AP that it knows "Carlos E.R." <robin_listas@es.invalid> - 2026-09-08 11:51 +0200
      Re: Tablet refuses to connect to an AP that it knows "Carlos E.R." <robin_listas@es.invalid> - 2026-09-08 12:45 +0200
      Re: Tablet refuses to connect to an AP that it knows Maria Sophia <mariasophia@comprehension.com> - 2026-09-08 19:02 +0300
        Re: Tablet refuses to connect to an AP that it knows "Carlos E.R." <robin_listas@es.invalid> - 2026-09-08 18:54 +0200
          Re: Tablet refuses to connect to an AP that it knows Maria Sophia <mariasophia@comprehension.com> - 2026-09-08 21:03 +0400
            Re: Tablet refuses to connect to an AP that it knows Maria Sophia <mariasophia@comprehension.com> - 2026-09-08 21:07 +0400
  Re: Tablet refuses to connect to an AP that it knows Andy Burns <usenet@andyburns.uk> - 2026-09-08 11:51 +0100
    Re: Tablet refuses to connect to an AP that it knows "Carlos E.R." <robin_listas@es.invalid> - 2026-09-08 13:35 +0200
      Re: Tablet refuses to connect to an AP that it knows Andy Burns <usenet@andyburns.uk> - 2026-09-08 13:41 +0100
        Re: Tablet refuses to connect to an AP that it knows Maria Sophia <mariasophia@comprehension.com> - 2026-09-09 20:52 +0430

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