I have executed:
$ heroku login
But when I try to push, I\'m still asked for authentication:
$ git push heroku master Usern
Renaming the _netrc file to .netrc on Windows 7 in the userdir worked for me.
_netrc
.netrc
..after trying all the steps in many other tutorials.
Run the 3rd command in cmd in your userdir or the whole combo:
setx HOME %USERPROFILE% cd %HOME% REN _netrc .netrc