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= Cisco WLC4400 =
 * 201308 lightweight cisco ap's refuse to register after controller factory reset.
 * DHCP on router to enable ap's to find controller
   * option 43 hex f1 04 + [IP in hex]
   {{

 * Debug , ssh into controller
   *  show auth-list
   *  debug pm pki enable
      {{{
*spamReceiveTask: Aug 02 08:43:38.905: sshpmGetIssuerHandles: SSC is not allowed by config; bailing...
*spamReceiveTask: Aug 02 08:43:38.906: 00:11:5c:1b:8f:70 DTLS connection 0x1386ab68 closed by controller
*spamReceiveTask: Aug 02 08:43:38.906: CAPWAP DTLS connection closed msg

      }}}
  
   *  debug capwap events enable
      {{{
SSC is not allowed by config; bailing...
      }}}
http://www.cisco.com/en/US/products/ps6366/products_configuration_example09186a00806a426c.shtml
You can recognize this problem when a Lightweight AP Protocol (LWAPP)-converted AP does not associate to the WLC. When you troubleshoot the association problem, you see these outputs when you issue these debugs:
  *  debug capwap errors enable
    
...