How to fix the error 'localhost refused to connect'

This video covers four possible solutions to resolve the error localhost refused to connect. There may be a few common causes for this localhost error. The methods mentioned are simple. For demonstration, I am using the XAMPP webserver. I hope the video proves to be useful.
Thank you.

DNS flush Command:
ipconfig /flushdns

Browser setting address:
chrome://net-internals/#hsts

[mahamvibe]

Not fix problem I'm facing still error

[dubby]

Now how would you get this error ik it’s a confusing thing to ask but I need it for debugging