ssltap: 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/ssltap - from package: nss-tools

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

On Debian possible default full paths are:

/usr/bin/ssltap - from package: libnss3-tools

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

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