mconnect: 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/mconnect - from package: ucspi-tcp-ipv6
/usr/bin/mconnect - from package: ucspi-tcp

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

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