When remote debug session start I get this message:

"New debug session with //localhost/index.php has started.
But IDE could not find the project for the web debugging.
Breakpoints and other features may fail to work."

I set up this project same way as some other remote project which uses Vagrant and Laravel Homestead virtual box and doesn't show that message. Everything is double checked, even run "Setting wizzard" from Project > Project properties and passed with flying color.

I can jump to breakpoints but I always see that message no matter which file I debug!

System: Win 7
PHP Ed: 15012
PHP: 5.4.36

You'd better contact support and provide all the details including phpinfo, screenshot of all pages on the project properties and pages of project settings wizard.

This error was really bugging me and out of the blue had an eureka moment!
Just had to change localhost in nginx server_name settings to something like project-name.app and the error was gone!