16.09.2011 22:54, Peter Naulls wrote:
> I believe this is coincident with the connection dropping:
> 
> Sep 16 11:33:34 OpenWrt daemon.info hostapd: wlan0: STA 00:14:a5:80:84:02 
> WPA: 
> group key handshake completed (RSN)
> Sep 16 11:33:34 OpenWrt daemon.info hostapd: wlan0: STA 00:14:a5:80:84:02 
> WPA: 
> received EAPOL-Key 2/2 Group with unexpected replay counter
> Sep 16 11:33:34 OpenWrt daemon.info hostapd: wlan0: STA 00:14:a5:80:84:02 
> WPA: 
> received EAPOL-Key 2/2 Group with unexpected replay counter
> 
Here I also have got ar71xx box (dir-615-e4) and I also see similar lines in 
log:

Jan  1 00:10:48 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 00:20:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 00:20:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:30:50 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 00:30:50 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:30:50 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:40:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 00:40:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:40:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:40:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:50:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 00:50:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:50:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 00:50:51 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:00:48 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 01:10:48 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 01:10:48 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:20:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 01:20:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:20:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:30:50 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 01:30:50 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:30:50 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:40:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)
Jan  1 01:40:49 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
received EAPOL-Key 2/2 Group with unexpected replay counter
Jan  1 01:50:47 OpenWrt daemon.info hostapd: wlan0: STA 90:00:4e:76:57:0d WPA: 
group key handshake completed (RSN)

The only wireless client here is AMD C-50 based laptop with Atheros 
AR5B95 Wireless Controller in it. Surprisingly enough I do not experience
any wifi connections drops whatsoever. Connection seems to be running 
pretty smoothly. For last twenty hours I've been running bi-directional 
iperf testing UDP speed/connectivity between LAN and WiFi segments of 
my home network. Looking at the gathered per-second throughput log I can't
find any measurable speed drop for the moments "unexpected replay counter" 
showed in the system log of the ar71xx box.

Thus this messages in logs might be unrelated to the clients drop issue you
are running into.

-- 
Best regards,
Alexey Loukianov                          mailto:mooro...@mail.ru
System Engineer,                            Mob.:+7(926)218-1320
*nix Specialist


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