WLC and ISE guest access COA

We are migrating to ISE for guest access and are having problems with the COA being delivered after a successful authentication. ISE attempts to send it but nothing changes on the WLC. The message in ISE is Dynamic Authorization failed and a message that ISE didn't receive a response from the NAD, verify communication. What is odd is the original guest request comes in from the IP address of the service port on the WLC but anything doing with the COA is seen from the management. I have both IP's defined for the device in ISE. I am about to do a session reauthentication within ISE and the WLC applies the changes. I have verified that RFC 3576 is enabled, but the show radius rfc3576 stats shows no values. The WLC is running 7.6.130. I have attempted to debug on the WLC side to see if the message is even being delivered but non the debugs i have attempted seem to offer any good information.
Anyone have any suggestions?
Thanks,
Joe

Hi Joe,
I dont really know what you are trying to do with the COA , as it is used in the CWA solution and BYOD solution as well. But even before trying that , I would advise you to go step by step and solve the n/w issue first. You are able to see the request from service port which should not happen because then the incoming/outgoing traffic takes different path. You must be facing this situation as you might have some network routes matching ISE subnet/Ip address in the GUI>Controller>Network routes as there is no need of those routes. If the service port needs to be used during controller down scenario then use a laptop in the same subnet of Service port ip and connect to the service port.
Regards
Dhiresh
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