When you install Site24x7's Linux server monitoring agent, use one of the below mentioned commands depending upon your proxy configuration requirements.
bash Site24x7InstallScript.sh -i -key=<DEVICE_KEY> -automation=true -proxy=user:password@proxyhost:proxyport
bash Site24x7InstallScript.sh -i -key=<DEVICE_KEY> -automation=true -proxy=user@proxyhost:proxyport
bash Site24x7InstallScript.sh -i -key=<DEVICE_KEY> -automation=true -proxy=proxyhost:proxyport