tcpcryptd: 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/tcpcryptd - from package: tcpcryptd

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

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