#==> Edit/Create /lib/systemd/system/radsecproxy.service and give it this content below

[Unit]
Description=NREN radsecproxy
ConditionPathExists=/usr/local/etc/radsecproxy.conf
After=network.target
Documentation=man:radsecproxy(1) https://radsecproxy.github.io/radsecproxy.conf.html

[Service]
Type=forking
ExecStart=/usr/local/sbin/radsecproxy -i /run/radsecproxy.pid
PIDFile=/run/radsecproxy.pid
ProtectSystem=full
PrivateDevices=true
PrivateTmp=true
ProtectHome=true

[Install]
WantedBy=multi-user.target

#==> Then reload the system daemon
#   $ sudo systemctl daemon-reload

#==> create the pid file for radsecproxy
#   $ sudo touch /run/radsecproxy.pid

#==> Then start and enable radsecproxy
#   $ sudo systemctl start radsecproxy 
#   $ sudo systemctl enable radsecproxy