wpa_supplicant 4 way handshake timeout with some access points

Peer, Ilan ilan.peer at intel.com
Tue Dec 22 00:00:52 PST 2015

> -----Original Message-----
> From: Hostap [mailto:hostap-bounces at lists.infradead.org] On Behalf Of
> Russell Senior
> Sent: Tuesday, December 22, 2015 06:15
> To: Jouni Malinen
> Cc: hostap at lists.infradead.org; Galen Seitz
> Subject: Re: wpa_supplicant 4 way handshake timeout with some access
> points
> On Mon, Dec 21, 2015 at 2:14 PM, Jouni Malinen <j at w1.fi> wrote:
> > On Mon, Dec 21, 2015 at 11:52:32AM -0800, Galen Seitz wrote:
> >> We are also continuing to to work on collecting relevant
> >> time-correlated packet and wpa_supplicant logs.  In the meantime, I
> >> thought I would ask whether anyone has any seen this type of problem
> >> and whether there is a fix or workaround.
> >
> > There are way too many possible reasons for this type of issues to
> > even try to speculate on what could have happened without seeing those
> logs.
> > In other words, I'd recommend trying again once the logs are available..
> Jouni, et al.
> Here are links to the wpa_supplicant log and an over-the-air packet capture
> made from a nearby device, respectively:
> https://personaltelco.net/~russell/wpa2j.log
> https://personaltelco.net/~russell/snoopy2j.pcap

>From a quick look at the sniffer capture and log file, it seems that there is a delay between the time that 3/4 is
received on the station (and acked) to the time it is been processed by the wpa_supplicant. For example have a look
at packet # 1304, it is received immediately after 2/4 is acked, but 4/4 is not seen. After about 1 seconds the AP tries
to send 3/4 once again (different sequence number), and only afterward 4/4 is send. However, in the log it looks like
the first 3/4 is processed only after a delay of 1 sec., and this one is probably dropped by the AP.

Note that after this the other 3/4 are received and are being processed, but no keys are installed, as the keys are already installed.

You might want to check why the RX messages delayed in the driver.



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