why my client fail to authentication failure when I run radlogin

Hello, I'm new in Radius, I have read through and follow to all the messages and documents. Here is my setup, I have run server and client on the same linux machine. I able to run 'radtest' and 'radclient' command, and I did successfully received correct response. However, when I tried to run radlogin command, i kept getting this output on my client side; Radius: authentication failure local: authentication failure when I run radexample, I did get successful authentication with the username and password. However, when i tried to run radacct, my client seems that stop working until i press on "Ctrl+C". Any idea? what is causing the problem? Anybody can help me, please?? Many thanks. -- Best Regards, Jenny