Check the image by clicking here:
This can happen when there is another service running type webserver (eg. Skype, Apache, etc) which occupies TCP port 80.You should close the application which uses port 80.
In Windows10, open Task Manager. Check the image by clicking here:
Open ‘Network’ tab and if everything is configured correctly, in “Listening Ports” you should find EclerNet Manager using port 80. Check the image by clicking here:
If you see another application using port 80, you should close it or change the port it uses. It’s not possible to change port for EclerNet Manager Web Server. In some cases, Windows 10 uses TCP port 80. To make this port available, open ‘Windows Features’, expand ‘Internet Information Services’ and disable ‘World Wide Web Services’. Check the image by clicking here: