I have the same problem. The ipw2100 card can not get IP address through DHCP when use WEP enc mode, but it's fine in NOWEP mode. My Ubuntu is feisty, up-to-dated from dapper.
Some info: # dmesg|grep -i network [ 22.772000] ipw2100: Intel(R) PRO/Wireless 2100 Network Driver, git-1.2.2 [ 22.964000] ipw2100: Detected Intel PRO/Wireless 2100 Network Connection [ 592.308000] ipw2100: Intel(R) PRO/Wireless 2100 Network Driver, git-1.2.2 [ 592.312000] ipw2100: Detected Intel PRO/Wireless 2100 Network Connection [EMAIL PROTECTED]:~# uname -a Linux fan4 2.6.20-14-386 #2 Mon Apr 2 20:34:35 UTC 2007 i686 GNU/Linux [EMAIL PROTECTED]:~# cat /etc/issue Ubuntu feisty (development branch) \n \l [EMAIL PROTECTED]:~# -- ipw2100/2200 unable to associate with access point https://bugs.launchpad.net/bugs/30712 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs