sounds like your proxy, or a firewall, is still blocking access. Are you sure those settings are set correctly,and can you hit that url successfully from a browser that is set up with the same proxy settings?
Also seems that you dont have exceptions specified for your proxy. Is that correct? You can see what exceptions are specified in IE under the “Connections” tab of “Internet Options” in internet. On that page, hit the “Settings” button, and in the new window you should see a “Proxy Server” section. Hit the “Advanced” tab to see the exceptions.