i use freeradius + mysql.
anthentication always fails, but i don't know why.
pls help me ,thanx.

follow is debugging information:

rad_recv: Access-Request packet from host 192.168.3.120:23355, id=184, length=90        User-Name = "shenwei"
        CHAP-Password = 0x5cfc40a0aa43189847d9cc9c1574afbd0b
        NAS-IP-Address = 192.168.3.120
        NAS-Identifier = "OpenH323GK"
        NAS-Port-Type = Virtual
        Service-Type = Login-User
        CHAP-Challenge = 0x42417828
        Framed-IP-Address = 192.168.3.120
  Processing the authorize section of radiusd.conf
modcall: entering group authorize for request 4
  modcall[authorize]: module "preprocess" returns ok for request 4
  rlm_chap: Setting 'Auth-Type := CHAP'
  modcall[authorize]: module "chap" returns ok for request 4
  modcall[authorize]: module "mschap" returns noop for request 4
    rlm_realm: No
'@' in User-Name = "shenwei", looking up realm NULL
    rlm_realm: No such realm "NULL"
  modcall[authorize]: module "suffix" returns noop for request 4
  rlm_eap: No EAP-Message, not doing EAP
  modcall[authorize]: module "eap" returns noop for request 4
    users: Matched entry DEFAULT at line 152
  modcall[authorize]: module "files" returns ok for request 4
radius_xlat:  'shenwei'
rlm_sql (sql): sql_set_user escaped user --> 'shenwei'
radius_xlat:  'SELECT id,UserName,Attribute,op Value FROM radcheck WHERE Username = 'shenwei' ORDER BY id'
rlm_sql (sql): Reserving sql socket id: 0
rlm_sql: The 'op' field for attribute 'CHAP-Password = =' is NULL, or non-existent.
                                       -----------------?   -------?
rlm_sql: You MUST FIX THIS if you want the configuration to behave as you expect.
            -----------------?
radius_xlat:  'SELECT radgroupcheck.id,radgroupcheck.GroupName,radgroupcheck.Attribute,radgroupcheck.Value,radgroupcheck.op  FROM radgroupcheck,usergroup WHERE usergroup.Username = 'shenwei' AND usergroup.GroupName = radgroupcheck.GroupName ORDER BY radgroupcheck.id'
radius_xlat:  'SELECT id,UserName,Attribute,op Value FROM radreply WHERE Username = 'shenwei' ORDER BY id'
radius_xlat:  'SELECT radgroupreply.id,radgroupreply.GroupName,radgroupreply.Attribute,radgroupreply.Value,radgroupreply.op  FROM radgroupreply,usergroup WHERE usergroup.Username = 'shenwei' AND usergroup.GroupName = radgroupreply.GroupName ORDER BY radgroupreply.id'
rlm_sql (sql): No matching entry in the database for request from user [shenwei]rlm_sql (sql): Released sql socket id: 0
  modcall[authorize]: module "sql" returns notfound for request 4
modcall: group authorize returns ok for request 4
  rad_check_password:  Found Auth-Type CHAP
auth: type "CHAP"
  Processing the authenticate section of radiusd.conf
modcall: entering group Auth-Type for request 4
  rlm_chap: login attempt by "shenwei" with CHAP password
  rlm_chap: Could not find clear text password for user shenwei
  modcall[authenticate]: module "chap" returns invalid for request 4
modcall: group Auth-Type returns invalid for request 4
auth: Failed to validate the user.





database table:

mysql> select * from radcheck;
+----+----------+---------------+----+---------+
| id | UserName | Attribute     | op | Value   |
+----+----------+---------------+----+---------+
|  1 | shenwei  | CHAP-Password | =  | shenwei |
+----+----------+---------------+----+---------+



                                                                    shenwei

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