checksctp: 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 CentOS possible default full paths are:

/usr/bin/checksctp - from package: lksctp-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/checksctp - from package: lksctp-tools

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

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