Visual Studio/C#: Nuget Unable to connect to remote server

Clearing HTTP_PROXY worked for me.

Let me fix it myself

Important: This section, method, or task contains steps that tell you
how to modify the registry. However, serious problems might occur if
you modify the registry incorrectly. Therefore, make sure that you
follow these steps carefully. For added protection, back up the
registry before you modify it. Then, you can restore the registry if a
problem occurs. For more information about how to back up and restore
the registry, click the following article number to view the article
in the Microsoft Knowledge Base: 322756 How to back up and restore the
registry in Windows

To reset your Internet Explorer proxy settings yourself, follow these
steps:

  1. On Windows XP, click Start, or on Windows Vista or Windows 7, click
    , and then click Run. On Windows 8 or Windows 8.1, to access the Run
    command, press the Windows logo key Windows logo key + R. Or, swipe
    in from the right edge of the screen, and then tap Search (or if you
    are using a mouse, point to the upper-right corner of the screen,
    move the mouse pointer down, and then click Search). Type Run in
    the search box, and then tap or click Run.
  2. In the Run text box, copy (CTRL+C) and paste (CTRL+V) or type the
    following: reg add
    “HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings”
    /v ProxyEnable /t REG_DWORD /d 0 /f
  3. Click OK.
  4. On Windows XP, click Start , or on Windows Vista or Windows 7, click
    , and then click Run. On Windows 8 or Windows 8.1, to access the Run
    command, press the Windows logo key Windows logo key + R. Or, swipe
    in from the right edge of the screen, and then tap Search (or if you
    are using a mouse, point to the upper-right corner of the screen,
    move the mouse pointer down, and then click Search). Type Run in
    the search box, and then tap or click Run.
  5. In the Run text box, copy (CTRL+C) and paste (CTRL+V) or type the following: reg delete
    “HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings”
    /v ProxyServer /f
  6. Click OK.

From http://support.microsoft.com/kb/2289942 Thanks @Sandy

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