I have a 2006 with 2 1242 APs connected to it. The problem I have is the 2 APs keep rebooting. they come up, get a DHCP address, stay up for a minute or so and restart. The log on the controller shows this each time it happens:
Thu Apr 20 10:54:39 2006 [ERROR] spam_lrad.c 2544: Security processing of Image Data failed from AP 00:16:47:b2:0a:48
Thu Apr 20 10:54:39 2006 [ERROR] spam_crypto.c 653: Failed decryption of message from AP 00:16:47:B2:0A:48
Thu Apr 20 10:54:24 2006 [ERROR] spam_lrad.c 5973: Refusing image download to AP 00:16:47:b2:0a:48 - Unable to open file /bsn/ap//c1240
I had the same problem with some 1231 APs with a 4402 controller. If you watch the APs console while it is rebooting, you'll notice that it can't get a certificate. I finally figured out that the time was different (wrong time zone) wrong on the controller compared to what I gave the APs when I upgraded them to LWAPP.