That is because your AP is allowing Open Authentication. WIth Open authentication, even if the WEP key is not configured you will be allowed access to the network. Choose Mandatory option on the AP and then you will see the difference. Clients with no wep will be denied access to the network.
I think your problem with not getting DHCP when WEP key is on (both AP and client) is probably is a typo error in the WEP key. Please doublecheck the WEP key entered on both AP and ACU utility.
i was having the exact same problem before i changed my wep keys on both ends. check your wep key.. you can get a wep key generator by searching google for '128 bit wep key generator' put that new key in and BEFORE you apply it to your access point, read and type in the new wep key in your clients. read and type two at a time. mark it off by twos if necessary, but make sure that they are both exactly the same.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...