ntlm_auth: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/ntlm_auth - from package: samba4-winbind-clients
/usr/bin/ntlm_auth - from package: samba-winbind-clients

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ntlm_auth - from package: winbind

You may install the required package with command apt-get install {package}

Error in other languages:
ntlm_auth: bevel nie gevind nie
ntlm_auth: comandă negăsită
ntlm_auth: comando não encontrado
ntlm_auth: commande introuvable
ntlm_auth: command not found
ntlm_auth: käsku ei ole
ntlm_auth: không tìm thấy lệnh
ntlm_auth: komanda nerasta
ntlm_auth: Kommando nicht gefunden.
ntlm_auth: kommandot finns inte
ntlm_auth: komut yok
ntlm_auth: nie znaleziono polecenia
ntlm_auth: níor aimsíodh an t-ordú
ntlm_auth: no se encontró la orden
ntlm_auth: no s'ha trobat l'ordre
ntlm_auth: opdracht niet gevonden
ntlm_auth: parancs nem található
ntlm_auth: perintah tidak ditemukan
ntlm_auth: príkaz nenájdený
ntlm_auth: příkaz nenalezen
ntlm_auth: команда не найдена
ntlm_auth: командата не е открита
ntlm_auth: 命令找不到
ntlm_auth: コマンドが見つかりません