Hi, Please enable the %{request:Request-Number} variable in the FreeRadius 3.x  xlat environment. By using this, the error messages displayed in the freeradius error log can be easily linked to the messages displayed in the line log. In the error log file:  ERROR: (92456386) eap_peap: ERROR: (TLS) PEAP - Alert read:fatal:unknown CA, In the line log: linelog auth_detail {     filename = ${logdir}/auth_detail.log     permissions = 0640     format = "req_num=%{request:Request-Number} src=%{Packet-Src-IP-Address} user=%{User-Name result=%{reply:Packet-Type}" } Thank You in advance for your help. Regards, István