Works in debug mode but not service mode

Hello all, I'm using the Windows binary distribution of FreeRadius, to receive accounting logs from Cisco routers. Setup-wise, I try to keep it to a minimum; mostly from the FreeRadius tutorials. After the setup, I am able to receive the log posts in debug mode, but not in the Windows Service mode. Is there anything different between the modes, perhaps the security authentication? Hope to get some good help here. Thanks.