rcopenwsmand: command not found

Have You tried accessing the binary with the full path?

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/sbin/rcopenwsmand - from package: openwsman-server

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