Google Drive with proxy authentication

I'm unable to connect the Google Drive application to the Internet. I'm quite sure it's because of the proxy authentication. How can I fix this problem?

Windows 7 64 bit, proxy with authentication.

I'm behind a proxy at work which requires proxy authentication, and wouldn't work with Dropbox. So I followed the instructions in Allow Dropbox to authenticate with an NTLM proxy server to setup Dropbox with Cntlm (a kind of local machine proxy server). Happily you can make Google Drive use the same localhost proxy to connect to the Internet by simply changing your browser settings.

In Internet Explorer: Tools -> Internet Options -> Connections Tab -> LAN settings button.

Set the proxy server address to localhost and the port to whatever you configured Cntlm to use (3128 in my case).

Press OK to the settings and restart Google Drive. So long as your corporate firewall isn't blocking the actual web addresses for Google Drive you should now be OK, and you should still be able to browse.

In fact, Google says: "Google Drive for Mac/PC supports all unauthenticated proxies that are configured by the operating system."

I guess this is the same that "Google Drive for Mac/PC doesn't support authenticated proxies".