I installed a fresh copy of Symfony on my localhost at htdocs\symfony-fresh and the file structure is:

Now I run the following in git bash:
$ php bin/console server:run
then I was suggested to browse at 127.0.0.1:8000 to see the fresh installation of symfony. It works like a charm. But one day later I browse at 127.0.0.1:8000 and I can see the following error message:
This site can’t be reached
127.0.0.1 refused to connect.
It seems server is offline. I checked my apache & Mysql is running.

Then I tried to run the command again:
$ php bin/console server:run
But same problem is going on. I am new in Symfony and enjoying to learn, but this problem stuck me. What should I do to run this app browsing at 127.0.0.1/symfony-fresh or localhost/symfony-fresh?