This is the only solution that has worked for me when trying to
install watir behind a firewall (THANK YOU!). I had to use the full
URL (found using a ping), and I found the correct port in use in the
browser settings. When I did this using the system environmental
variable, I was failing to authenticate (command line threw a 407
response). Using the command prompt is the only thing that worked.
I've been able to update system and install watir. THANKS!