This seems to be a common topic......
I have looked through the troubleshooting guide and still have no resolution to the problem. My WLC is not seeing any LWAPP messages come through, as the AP is not resolving the controller address. I can ping the DNS server where the CISCO-LWAPP-CONTROLLER is. Here is a sample of the output from the AP:
Apr 30 09:32:42.120: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to administratively down
Apr 30 09:32:42.134: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
Apr 30 09:32:43.127: %CAPWAP-3-ERRORLOG: Did not get log server settings from DHCP.
Apr 30 09:32:43.158: %CAPWAP-3-ERRORLOG: Could Not resolve CISCO-CAPWAP-CONTROLLER.<removed>.com
Apr 30 09:33:33.164: %CAPWAP-5-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.
Not in Bound state.
Apr 30 09:33:43.792: %DHCP-6-ADDRESS_ASSIGN: Interface GigabitEthernet0 assigned DHCP address 10.0.48.51, mask 255.255.255.128, hostname AP0022.bd1a.6368
Apr 30 09:33:48.666: %CAPWAP-3-ERRORLOG: Invalid event 29 & state 4 combination.
Apr 30 09:33:48.666: %CAPWAP-3-ERRORLOG: SM handler: Failed to process timer message.
Apr 30 09:33:48.667: %CAPWAP-3-ERRORLOG: Failed to handle timer message.
Apr 30 09:33:48.667: %CAPWAP-3-ERRORLOG: Failed to process timer message.
Apr 30 09:33:48.667: %CAPWAP-3-ERRORLOG: Discovery interval timer expiry handler failed.
Apr 30 09:33:48.704: %CAPWAP-5-CHANGED: CAPWAP changed state to DISCOVERY
Thank you for your time.