confreport.cgi: 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/lib/xymon/server/bin/confreport.cgi - from package: xymon

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

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