1131 and 1141 APs not finding the controller

We have deployed about 40 of these and about half have found the controller. The others have not. I have used option 43 in the past but lately they were able to find the contrller without that. I also took out the lwapp-controller name out of dns as we have 4 buildings of these etc. Should I put the controller name in dns and what is that default name.
thanks
Gary

If the AP's are not on the same subnet as the controller, and you are not using Over the Air Provisioning, then you need to use DHCP Option 43, put your DNS entry back in, or set the controller address manually via the console port on the AP.
The host name for the DNS entry is CISCO-LWAPP-CONTROLLER. If you're adding that entry, then you might want to also add CISCO-CAPWAP-CONTROLLER pointing to the same address. While I believe that all current AP's will try to resolve CISCO-LWAPP-CONTROLLER (even if they are CAPWAP APs), this may not be the case in the future.
We use the DNS feature and then set the AP's appropriate primary/secondary controller after it joins.
Here's a good article about the AP join process:
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a00806c9e51.shtml
Here's a good article about troubleshooting AP's that won't join:
http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00808f8599.shtml

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