trouble shooting WPA2 four way hand shake error

Jemiah Aitch jemiaha
Thu Dec 6 12:19:27 PST 2012

One option would be to force the supplicant to show you the key in the
debug output. It's saying that you may have a key mismatch so if you can
force it to show you what it's using you could verifiy it. The variable
is wpa_debug_show_keys just don't forget to turn it back off.  :)

On Wed, Dec 5, 2012 at 4:00 PM, Gong Cheng <rizhard at> wrote:

> This is the screenshot, you can see a pre shared key incorrect error.
> All my other machines using the same key work perfectly...
> Sent from my Windows Phone
> -----Original Message-----
> From: "Sven Neumann" <s.neumann at>
> Sent: 12/5/2012 1:01 PM
> To: "Jemiah Aitch" <jemiaha at>
> Cc: "gcheng at" <gcheng at>;
> "hostap at" <hostap at>
> Subject: Re: trouble shooting WPA2 four way hand shake error
> Hi,
> On Wed, 2012-12-05 at 12:48 -0600, Jemiah Aitch wrote:
> > Check that your kernel has all of the required
> > encryption components included. I had a similar issue and it turned
> > out that CRYPTO_AES hadn't been included. This was on an ARM processor
> > for an embedded kernel from TI. I'm not sure what it would be for
> > Ubuntu.
> Does wpa-supplicant actually use the kernel crypto API or is this driver
> dependent?
> Regards,
> Sven
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