GitHub - HTTPS access

I am unable to clone my repository via HTTPS:

git clone https://github.com/walterjwhite/project.configuration.git

Output:

Initialized empty Git repository in ./project.configuration/.git/error: Failed connect to github.com:443; Connection refused while accessing https://github.com/walterjwhite/project.configuration.git/info/refsfatal: HTTP request failed

I have configured the .netrc file with my login and password as well as the machine or server I am connecting to.