I've gone through and attempted to setup RADIUS, but when i plug in a device, the switch never reaches out to my NPS server.

Any help would be great.

!System Software Version 6.7.1.17

ip address 192.168.19.8 255.255.255.0
exit
ip default-gateway 192.168.19.1
username "admin" password privilege 15 encrypted
dot1x system-auth-control
radius server source-ip 192.168.19.8
radius server auth 192.168.140.4
primary
name "DC02"
key 7 " "
exit

interface Gi1/0/10
no green-mode energy-detect
no green-mode eee
switchport mode general
switchport general allowed vlan add 500 tagged
switchport access vlan 140
authentication host-mode single-host
authentication event fail action authorize vlan 100
authentication periodic
exit
!