I\'ve tried both using export http_proxy=http://[username]:[pwd]@[proxy] and git config --global http.proxy http://[username]:[pwd]@[proxy].
export http_proxy=http://[username]:[pwd]@[proxy]
git config --global http.proxy http://[username]:[pwd]@[proxy]
I've been using ntlmaps and been having good results getting through windows/NT proxies: http://ntlmaps.sourceforge.net/
The git configuration is:
git config --global http.proxy http://localhost:5865