Hi I want to change authentication pap to chap. The users with clear passwords are in ldap server. The error is : rlm_ldap: - authenticate rlm_ldap: Attribute "User-Password" is required for authentication. Cannot use "CHAP-Password". Login incorrect (rlm_chap: Clear text password not available): I saw the problem in faq but I didn't find what is my mistake. The config is: in users : DEFAULT Client-IP-Address == 10.10.10.2 , Auth-Type := Vpn, Autz-Type := Vpn, Post-Auth-Type := Vpn, Session-type := Vpn in radius.conf: ldap ldap-Vpn{ .... password_attribute = userPassword password_header = "{clear}" } authorize { chap Autz-Type Vpn{ ldap-Vpn chap } } authenticate { Auth-Type CHAP { chap } Auth-Type Vpn{ chap ldap-Vpn } } .... what is my mistake? should I do any other config or change in ldap.attrmap?