I'm getting this error, but obviously I'm connected! I entered a ticket with Heroku 15 hours ago but received no response.
C:\>heroku config
Enter your Heroku credentials.
Email: myemail@mydomain
Password (typing will be hidden):
! Unable to connect to Heroku API, please check internet connectivity and try again.
$ heroku status
! Unable to connect to Heroku API, please check internet connectivity and try again.
I even re-installed Heroku client. I even pushed to Heroku while this problem was happening through Git.