Where are the error messages that you are talking about? The 'dmesg'
output doesn't look complete. In my case, error messages appear after
the 'NET: Registered protocol family ..' line and read:

[  823.768203] wlan0: association FAILED: peer sent Status Code 18
(Assoc denied: requesting STA doesnt support all data rates in basic
set)

For some reason, the 'acx' driver picks up a rate of 2M whereas the AP
only offers 11M. The problem thus is not an NM problem in the first
place but a driver problem. Available rates are obtained via 'iwlist':

iwlist wlan0 rates
wlan0     1 available bit-rates :
          11 Mb/s
          Current Bit Rate=11 Mb/s

After setting the rate to 11M by hand or an entry in 'interfaces', it's
finally least possible to bring up the network with 'ifup wlan0'.

-- 
ACX111/ACX100 based WLAN Card (DWL-G650+) wont connect to AP with wep key in 
edgy
https://bugs.launchpad.net/bugs/70523
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