In 7.0 You can use the cli command (might be there in later 6.0 but I can't test ATM)
Config dhcp clear-lease then either the up address or all
Config dhcp clear-lease 192.168.100.0
Or
Config dhcp clear-lease all
If not the only way to clear the leases is a reboot of the WLC.
Steve
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HTH,
Steve
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