I was able to clone a copy of this repo over HTTPS authenticated. I\'ve made some commits and want to push back out to the GitHub server. Using Cygwin on Windows 7 x64.
Add the user name as part of the URL and This error happens because the git command is hitting http instead of https. So set the url
git remote set-url origin https://@github.com/Path_to_repo.git
After which you will be prompted for password: