hi,
I've installed poptop and freeradius well and both are working,
but when I try to connect from a vpn connection or even radtest some error occured.
what I need to add to users.conf for a simple radtest connection or a vpn client?

it's the output of debug mode for vpn client, some thing like this has been printed for radtest also:


rad_recv: Access-Request packet from host 127.0.0.1:32770, id=30, length=132
        Service-Type = Framed-User
        Framed-Protocol = PPP
        User-Name = "root"
        MS-CHAP-Challenge = 0x4d1a9b1028ef83957754c83ce0f55
e01
        MS-CHAP2-Response = 0x9e000d1394f73d58cc731cd6cf58de7cb74f00000000000000008c6daec89825fb28b90bb60b737fb683a4a80f6252935547
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 0
  Processing the authorize section of radiusd.conf
modcall: entering group authorize for request 11
  modcall[authorize]: module "preprocess" returns ok for request 11
  modcall[authorize]: module "chap" returns noop for request 11
  rlm_mschap: Found MS-CHAP attributes.  Setting 'Auth-Type  = mschap'
  modcall[authorize]: module "mschap" returns ok for request 11
    rlm_realm: No '@' in User-Name = "root", looking up realm NULL
    rlm_realm: No such realm "NULL"
  modcall[authorize]: module "suffix" returns noop for request 11
  rlm_eap: No EAP-Message, not doing EAP
  modcall[authorize]: module "eap" returns noop for request 11
    users: Matched entry DEFAULT at line 152
    users: Matched entry DEFAULT at line 171
    users: Matched entry DEFAULT at line 183
  modcall[authorize]: module "files" returns ok for request 11
modcall: leaving group authorize (returns ok) for request 11
  rad_check_password:  Found Auth-Type MS-CHAP
auth: type "MS-CHAP"
  Processing the authenticate section of radiusd.conf
modcall: entering group MS-CHAP for request 11
  rlm_mschap: No User-Password configured.  Cannot create LM-Password.
  rlm_mschap: No User-Password configured.  Cannot create NT-Password.
  rlm_mschap: Told to do MS-CHAPv2 for root with NT-Password
radius_xlat: Running registered xlat function of module mschap for string 'Challenge'
 mschap2: 4d
radius_xlat: Running registered xlat function of module mschap for string 'NT-Response'
radius_xlat:  '/path/to/ntlm_auth --request-nt-key --username=root --challenge=f1090a99b916ef69 --nt-response=8c6daec89825fb28b90bb60b737fb683a4a80f6252935547'
Exec-Program: /path/to/ntlm_auth --request-nt-key --username=root --challenge=f1090a99b916ef69 --nt-response=8c6daec89825fb28b90bb60b737fb683a4a80f6252935547
Exec-Program output: Exec-Program: FAILED to execute /path/to/ntlm_auth: No such file or directory
Exec-Program-Wait: plaintext: Exec-Program: FAILED to execute /path/to/ntlm_auth: No such file or directory
Exec-Program: returned: 1
  rlm_mschap: External script failed.
  rlm_mschap: FAILED: MS-CHAP2-Response is incorrect
  modcall[authenticate]: module "mschap" returns reject for request 11
modcall: leaving group MS-CHAP (returns reject) for request 11
auth: Failed to validate the user.
Delaying request 11 for 1 seconds
Finished request 11
Going to the next request
--- Walking the entire request list ---
Waking up in 1 seconds...
--- Walking the entire request list ---
Waking up in 1 seconds...
--- Walking the entire request list ---
Sending Access-Reject of id 30 to 127.0.0.1 port 32770
Waking up in 4 seconds...
--- Walking the entire request list ---
Cleaning up request 11 ID 30 with timestamp 47152198
Nothing to do.  Sleeping until we see a request.