Hi, David! I am sorry , but i am already have all my radius client in mysql radius\nas database. I don`t want to allow unknown client connect to my Radius server? I just want to log this connection attempt to log file. Thanks. here is debug(skipped some things) =============== freeradius -X FreeRADIUS Version 2.0.4, for host i486-pc-linux-gnu, built on Sep 7 2008 at 23:35:34 Copyright (C) 1999-2008 The FreeRADIUS server project and contributors. Starting - reading configuration files ... including configuration file /etc/freeradius/radiusd.conf including configuration file /etc/freeradius/proxy.conf including configuration file /etc/freeradius/clients.conf including configuration file /etc/freeradius/snmp.conf including configuration file /etc/freeradius/sql.conf including configuration file /etc/freeradius/sql/mysql/counter.conf including configuration file /etc/freeradius/sqlippool.conf including configuration file /etc/freeradius/sql/mysql/ippool.conf including configuration file /etc/freeradius/policy.conf including files in directory/etc/freeradius/sites-enabled/ including configuration file /etc/freeradius/sites-enabled/default including dictionary file /etc/freeradius/dictionary main { prefix = "/usr" localstatedir = "/var" logdir = "/var/log/freeradius" libdir = "/usr/lib/freeradius" radacctdir = "/var/log/freeradius/radacct" Module: Linked to module rlm_detail Module: Instantiating detail detail { detailfile = "/var/log/freeradius/radacct/%{Client-IP-Address}/detail-%Y%m%d" header = "%t" detailperm = 384 dirperm = 493 locking = no log_packet_header = no } radiusd: #### Loading Virtual Servers #### server { modules { Module: Checking authenticate {...} for more modules to load Module: Linked to module rlm_mschap Module: Instantiating mschap mschap { use_mppe = yes require_encryption = yes require_strong = yes with_ntdomain_hack = no } Module: Instantiating sql sql { driver = "rlm_sql_mysql" server = "localhost" port = "" login = "radius" password = "test123" radius_db = "radius" read_groups = yes sqltrace = no sqltracefile = "/var/log/freeradius/sqltrace.sql" readclients = yes Listening on authentication address * port 1812 Listening on accounting address * port 1813 Listening on proxy address * port 1814 Ready to process requests. =================================================== Ignoring request to authentication address * port 1812 from unknown client ===========