Getting around proxy should help you specifically. The error 501 Protocol scheme '' is not supported is your clue. I would think that you did something like SET HTTP_PROXY = myproxyaddress WHERE you need to do it as SET HTTP_PROXY=http://myproxyaddress:port noticethe use of http the port and no spacing all important

If none of this solves it try the steps for a local repository and it may be the nature of you proxy causing the problems.