Hello. I hope someone can shine a light on my problem with Freeradius 3 and mschap (running on centos7 with samba/winbind) So long story short, I notice that every ~5 minutes there is a problem with NTLM_AUTH. Even with testing with radtest -t mscahp at the same time, I get: (10) Auth-Type MS-CHAP { (10) if (Realm == "um.si") { (10) if (Realm == "um.si") -> TRUE (10) if (Realm == "um.si") { (10) mschap_thor: Client is using MS-CHAPv1 with NT-Password (10) mschap_thor: Executing: /usr/bin/ntlm_auth --allow-mschapv2 --request-nt-key --username=%{%{Stripped-User-Name}:-%{%{User-Name}:-None}} --domain=%{%{mschap:NT-Domain}:-THOR} --challenge=%{%{mschap:Challenge}:-00} --nt-response=%{%{mschap:NT-Response}:-00}: (10) mschap_thor: EXPAND --username=%{%{Stripped-User-Name}:-%{%{User-Name}:-None}} (10) mschap_thor: --> --username=****** (10) mschap_thor: ERROR: No NT-Domain was found in the User-Name (10) mschap_thor: EXPAND --domain=%{%{mschap:NT-Domain}:-THOR} (10) mschap_thor: --> --domain=THOR (10) mschap_thor: mschap1: 31 (10) mschap_thor: EXPAND --challenge=%{%{mschap:Challenge}:-00} (10) mschap_thor: --> --challenge=316c3b72847b74c7 (10) mschap_thor: EXPAND --nt-response=%{%{mschap:NT-Response}:-00} (10) mschap_thor: --> --nt-response=273c482ad6ee3eeb8c21239368764a42d66c1b6ca8f0e98e Child PID 5238 is taking too much time: forcing failure and killing child. (10) mschap_thor: ERROR: Failed to read from child output (10) mschap_thor: External script failed (10) mschap_thor: ERROR: External script says: (10) mschap_thor: ERROR: MS-CHAP2-Response is incorrect I know this may not be a radius issue, beause of the fact that in-between the system works as expected and the line: Child PID 5238 is taking too much time: forcing failure and killing child, but I have my hopes up someone can point me in the right direction. On the backend there is a Windows AD, multiple DC (tried setting only 1 in samba, same issue), the server is domain joined. I have multiple servers with the same issue (in the same environment) What allso puzzles me, are the logs: Server 1: Fri May 28 14:35:27 2021 : ERROR: (59476) mschap_thor: ERROR: Failed to read from child output Fri May 28 14:35:31 2021 : ERROR: (59508) mschap_loki: ERROR: Failed to read from child output Fri May 28 14:35:35 2021 : ERROR: (59534) mschap_loki: ERROR: Failed to read from child output Fri May 28 14:40:03 2021 : ERROR: (60960) mschap_loki: ERROR: Failed to read from child output Fri May 28 14:40:08 2021 : ERROR: (60993) mschap_loki: ERROR: Failed to read from child output Fri May 28 14:40:12 2021 : ERROR: (61017) mschap_loki: ERROR: Failed to read from child output Fri May 28 14:40:14 2021 : ERROR: (61030) mschap_loki: ERROR: Failed to read from child output Fri May 28 14:40:15 2021 : ERROR: (61040) mschap_loki: ERROR: Failed to read from child output Server 2: Fri May 28 14:38:29 2021 : ERROR: (4) mschap_thor: ERROR: Failed to read from child output Fri May 28 14:38:44 2021 : ERROR: (5) mschap_thor: ERROR: Failed to read from child output It's like a blinker. One works, the other doesnt. Thank you for any tips. Klemen