I can also confirm the bug in Lucid.
I can connect (XP - Ubuntu 10.04) via an unencrypted or nearly
unencrypted (WEP) Ad-Hoc connection.
I noticed how the following fact, which might hint to the source of the
problem:
When I switch to WPA, the Ad-Hoc network an XP machine is listed as
encrypted, but not as an WPA encrypted network (my home network is WPA2
and listed as such).
XP asks for a password, but expects an WEP key (for the WPA network).
A network scan from another Ubuntu machine showed:
my home network with WPA2:
Cell 01 - Address: 00:26:4D:1A:7F:C7
ESSID:"Heimnetz"
Mode:Master
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=49/100 Signal level=-66 dBm
Encryption key:on
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Preauthentication Supported
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 12 Mb/s
24 Mb/s; 48 Mb/s
Extra:tsf=000002ecfd456932
the Ad-Hoc network (configured as WPA):
Cell 02 - Address: 3A:69:14:44:F2:1F
ESSID:"tralala"
Mode:Ad-Hoc
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=50/100 Signal level=-56 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Extra:tsf=0000000010656387
encrypted, but not marked as WPA.
I tried to configure it via the command line, but I'm missing the
iwconfig/ifconfig commands for the wireless WPA. I don't want to put
them into /etc/network/interfaces to avoid conflicts with my normal
setup.
--
incorrect encryption detected when logging on to WPA ad-hoc wireless network
https://bugs.launchpad.net/bugs/322902
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