I had same issue. I searched and found this.
http://oakgreen.blogspot.jp/2011/10/eclipse-proxy-settings-bug-and.html
This post says don’t set SOCKS proxy. I tried this advice, and connection was succeeded.
I did below:
- Open Network Connection Settings.
- Select Active Provider to “Manual”.
- Set HTTP/HTTPS proxy.
- Clear SOCKS proxy if this is set.(select SOCKS proxy row and click “Clear” button)
- Restart Eclipse to apply these settings.