Visual Studio 2012 "Extensions and Updates" "Unable to connect to the remote server"

Question

This has been the case unfortunatly for the past couple of months. I can't install new or update packages from Tools ==> Extensions and Updates I tried everything, yet I am unable to find the reason. I've tried :

1. Access NuGet and download packages from "Package Manager Console" Install-Package = SUCCESS
2. Access repositories using Web browsers, Visual studion internal browser = SUCCESS
3. Same window in Visual Studio 2010 = SUCCESS

Visual Studio 2012 - Doesn't work

Visual Studio 2010 - Works!

Answer 1

WeSam Abdallah's hint worked perfectly for me! Just try to open the link provided in HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\12.0_Config\ExtensionManager\Repositories{0f45e408-7995-4375-9485-86b8db553dc9}(Default) in your browser and see what it is changed to automatically. For Visual Studio 2013 I had to change the URL from https://go.microsoft.com/fwlink/?LinkID=309922 to https://visualstudiogallery.msdn.microsoft.com/services/dev12/extension.svc