title: Enterprise proxy blocking yarn, npm and git
body: <p>So I have been having some issues with git, npm and brew. It seems to be related to the enterprise proxy I used before. I am not using this computer anymore behind that enterprise proxy but it seems I haven't cleared all the proxy settings. I have cleared all the instances I can find in "Network settings" but there seems to be more. Anyone got a good idea for how to find where my proxy is kicking in and how to remove it? An example of how it looks in the Terminal </p>
  
  <p>brew install yarn</p>
  
  <p>==> Downloading <a href="https://homebrew.bintray.com/bottles/node-7.7.2.el_capitan.bottle.tar.gz" rel="nofollow noreferrer">https://homebrew.bintray.com/bottles/node-7.7.2.el_capitan.bottle.tar.gz</a></p>
  
  <p>curl: (7) Failed to connect to proxy.enterprise.com port 123: Operation timed out</p>