dmtcp_sshd: 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/bin/dmtcp_sshd - from package: dmtcp

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

On Debian possible default full paths are:

/usr/bin/dmtcp_sshd - from package: dmtcp

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