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 = 0x4d1a9b1028ef83957754c83ce0f55e01 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.