git clone 실패: HTTP request failed

$ git clone https://...
Initialized empty Git repository in /home/user/repo/.git/
error: The requested URL returned error: 403 Forbidden while accessing https://github.com/user/repo.git/info/refs

$ git push origin master
Initialized empty Git repository in /home/user/repo/.git/
error: The requested URL returned error: 403 Forbidden while accessing https://github.com/user/repo.git/info/refs