My boss asked me to set up a wireless hotspot at the company I work. I decided to use freeradius (first time used) and captive portal (under pfSense). I saw a few tutorial videos on YouTube and for a basic installation were all almost the same. *OS: Ubuntu Server 16.04 LTS* *Guide: *https://wiki.freeradius.org/guide/Getting-Started *User:* root Next are the commands I used for the first basic use: 1. root@radius:~# apt-get update -y && apt-get upgrade -y 2. root@radius:~# apt-get install -f freeradius freeradius-ldap 3. root@radius:~# freeradius -X *Failed binding to authentication address * port 1812: Address already in use** **/etc/freeradius/radiusd.conf[273]: Error binding to port for 0.0.0.0 port 1812* Really don't get why is freeradius telling the port is already in use. I took some port info, BEFORE the installation, and this is how it look: tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 320 10.10.10.252:22 10.10.10.18:29324 ESTABLISHED No further connections, not even any of them listening on 1812. After installation the netstat -van output: tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 10.10.10.252:22 10.10.10.18:29340 ESTABLISHED udp 0 0 0.0.0.0:47291 0.0.0.0:* udp 0 0 127.0.0.1:18120 0.0.0.0:* udp 0 0 0.0.0.0:1812 0.0.0.0:* udp 0 0 0.0.0.0:1813 0.0.0.0:* udp 0 0 0.0.0.0:1814 0.0.0.0:* According to the tutorial (https://wiki.freeradius.org/guide/Getting-Started) the output should be: |Ready to process requests| |Thanks in advance! | **