Hello Francis,
Seems the problem is the message server and the ICM are both listening on port, this is where the 302 is from.
You need to check and change the ICM port and message server port as follows:
ICM port: -T-code SMICM -> Menu Goto -> Services -> Select HTTP
-> Menu Service.
Message server port: T-code SMMS -> Menu Goto -> Services -> check the HTTP service.
You will have to change one of them because they are using the same port.
You may have to change the parameter ms/server_port_0 in the profile in order to avoid the above change lost after restart.
Regards,
David