I have configured FreeRadius to use Mysql.It seemed Mysql works well when I input "Radiusd -X". However when I use NtRadPing to test,I always get the following error: rad_recv: Access-Request packet from host 202.117.15.164:2244, id=0, length=43 Ignoring request from unknown client 202.117.15.164:2244 --- Walking the entire request list --- I insert items into the table 'nas' int the 'radius' database like : +----+----------------+-----------+-------+-------+------------+-----------+---------------+ | id | nasname | shortname | type | ports | secret | community | description | +----+----------------+-----------+-------+-------+------------+-----------+---------------+ | 1 | 202.117.15.164 | liv1 | other | NULL | testing123 | NULL | RADIUS Client | +----+----------------+-----------+-------+-------+------------+-----------+---------------+ But it doesn't work.