DHCP server

To clear active DHCP leases use the command:

config dhcp clear-lease all

DHCP Relay

When attempting to enable DHCP Relay from the Controller, Advanced page you may receive an uninformative message such as:

The corresponding CLI command returns slightly more useful info:

(Cisco Controller) >config dhcp proxy enable
Some WLAN configurations are inconsistent with the new configuration of the DHCP Proxy.
Please check the message log (‘show msglog’) for details.

This is probably due to configuration changes to the WLAN settings and the cisco bug CSCsq65895 present in releases starting with 5.0.148.2.

The workaround is to add a dummy DHCP server address in each WLAN