Ap-manager not communicating with network

I have a 4400 LAN controller where the ap-manager port is on the same subnet and VLAN as the management port but I cannot ping the ap-manager IP nor will the LWAP associate to it. What could be my problem?

Dear fellow,
We have the similar problem at our end. In our setup, for load balancing purposes, we are using both AP manager in active state. Some APs are associating with AP Manager1 while some are getting associated with AP Manager2. We also confirmed that setting is working perfectly fine. However, very interestingly in the arp cache of default router, we can only see the AP Manager1 ip address and its respective mac-address. We don't find the AP Manager2 ip and its mac-address. And ofcourse, these ip addresses are not pingable from default router (as stated in the discussion). We are running the code 3.2.150.10 on WLC 4402.
Can you please assist us in this regard, its much appreciated.
Thanks and regards.

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