[Unit]
Description=Transparent proxy  gateway for password protected proxies

[Service]
ExecStart=/usr/local/bin/transparent_proxy -h 127.0.0.1 -P 55000 -t proxy.example.com:6789 -u 'example uname' -p 'example password'
Restart=on-failure
RestartSec=1

[Install]
WantedBy=multi-user.target