My apologies for that mistake.. I have the following lines in modules section exec ntlm_auth { wait = no program = "/usr/bin/ntlm_auth --request-nt-key --domain=MYDOMAIN.COM --username=%{mschap:User-Name} --password=%{User-Password}" and I have ntlm_auth listed in authenticate section while running radiusd -X I get the following error. ********************************************************************************************************* [root@radious raddb]# /usr/sbin/radiusd -X -y Starting - reading configuration files ... reread_config: reading radiusd.conf Config: including file: /etc/raddb/clients.conf Config: including file: /etc/raddb/snmp.conf Config: including file: /etc/raddb/eap.conf Config: including file: /etc/raddb/sql.conf main: prefix = "/usr" main: localstatedir = "/var" main: logdir = "/var/log/radius" main: libdir = "/usr/lib" main: radacctdir = "/var/log/radius/radacct" main: hostname_lookups = no main: max_request_time = 30 main: cleanup_delay = 5 main: max_requests = 1024 main: delete_blocked_requests = 0 main: port = 0 main: allow_core_dumps = no main: log_stripped_names = no main: log_file = "/var/log/radius/radius.log" main: log_auth = no main: log_auth_badpass = no main: log_auth_goodpass = no main: pidfile = "/var/run/radiusd/radiusd.pid" main: user = "radiusd" main: group = "radiusd" main: usercollide = no main: lower_user = "no" main: lower_pass = "no" main: nospace_user = "no" main: nospace_pass = "no" main: checkrad = "/usr/sbin/checkrad" main: proxy_requests = yes security: max_attributes = 200 security: reject_delay = 1 security: status_server = no main: debug_level = 0 read_config_files: reading dictionary read_config_files: reading naslist Using deprecated naslist file. Support for this will go away soon. read_config_files: reading clients read_config_files: reading realms radiusd: entering modules setup Module: Library search path is /usr/lib Module: Loaded exec exec: wait = yes exec: program = "(null)" exec: input_pairs = "request" exec: output_pairs = "(null)" exec: packet_type = "(null)" rlm_exec: Wait=yes but no output defined. Did you mean output=none? Module: Instantiated exec (exec) Module: Loaded expr Module: Instantiated expr (expr) exec: wait = no exec: program = "/usr/bin/ntlm_auth --request-nt-key --domain=MYDOMAIN.COM --username=%{mschap:User-Name} --password=%{User-Password}" exec: input_pairs = "request" exec: output_pairs = "(null)" exec: packet_type = "(null)" Module: Instantiated exec (ntlm_auth) radiusd.conf[1685] Unknown Auth-Type "exec" in authenticate section. *************************************************************************************** thanks for the help in advance. SB