profphd_net: 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/profphd_net - from package: profphd-net

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

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