ccon: 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/ccon - from package: clusterssh

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

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