I had setup FreeRADIUS V3 on a virtual-box that runs Ubuntu 16.04 with the using of MySQL as a database.
Also, another virtual-box running Mikrotik RouterOS to simulate a connection between the PC and router. I have configured Mikrotik as a hotspot with FreeRADIUS through the Ubuntu virtual OS.
It was running like a charm.
Now I got a physical Mikrotik router and have connected it to the ISP router's Ethernet port to replicate the connection I created previously, but when connecting to the Mikrotik router through WiFi, and after entering username and password, I get the following error message:
Radius server not responding
I opened the debug mode in radius freeradius -X, and I found radius got the Mikrotik request and replied "Access-Accept"