adnsresfilter: 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 Debian possible default full paths are:

/usr/bin/adnsresfilter - from package: adns-tools

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

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