You need to set two settings to allow git to use your proxy:
git config --global http.proxy "[ ]:[password]@[address/url]:[port]"
Note both of the above settings. http.proxy and https.proxy.
You may also need to turn off secure certificate verification. Why? Some places use a self signed certificates on the proxy for use with internal domain names.
git config --global http.sslVerify false
More proxy settings:
npm config set proxy "[ ]:[password]@[address/url]:[port]"
npm config set https-proxy "[ ]:[password]@[address/url]:[port]"
Turning off secure certificate verification.
npm config set strict-ssl false
Thank you to the following for their posts providing the above information: