Some online services have certain port values to work, like the FTP, SSH, and the server for e-mail. In case of unresponsiveness or bad experience of these ports, some of the features may not be working properly. The port monitoring feature with UptimeRobot is used to keep checking the status of the ports to make sure they are available. Whenever a port is down or does not respond, Up... https://webstatus247.com/website-monitoring