pip behind corporate firewall

Problem: Unable to install virtualenv using pip behind the proxy

Solution: Similar to what we did when we installed git http://go-gaga-over-testing.blogspot.com.au/2015/04/setup-github-within-companys-firewall.html behind a company's firewall we shall set the proxy

pip install --proxy="myproxyname.mydomain.com:8080" virtualenv

Or 

pip install --proxy="http.proxy http[s]://userName:password(encoded)@proxyaddress:port" virtualenv

For more information and if this solution doesn't work for you :

Sources:
http://stackoverflow.com/questions/21468550/pip-not-working-behind-firewall
http://stackoverflow.com/questions/14149422/using-pip-behind-a-proxy