Hi Alan, I've installed FreeRadius-2.0.4 and I got some error saying ERROR: Failed to open socket: /usr/local/etc/raddb/radiusd.conf[210]: Error binding to port for 0.0.0.0 port 1812 but when I check in radiusd.conf ipaddr = * # interface = eth0 How can I fix this error? I have 2 ethernet cards, eth1 = 192.168.1.10 (DNS & iptables), eth0 = 192.168.0.10 (Wifi) Here a few thing that I'd edited: (uncomment) clients.conf client 192.168.0.0/24 secret = testing123-1 shortname = private-network-1 users add MarsindNet ClearText-Password := "testing123" Reply-Message := "Hello, %{User-Name}" eap.conf eap { default_eap_type = tls } tls { ..... fragment_size = 1024 include_length = yes } Next step I want to test Windows XP client but I couldn't find root.der & cert-clt.p12 as previous version have.