NuGet Package Manager Error Resolution

Today I encountered an error while I was trying to add a reference for newtonSoft.JSON from the NuGet Package Manager of Visual Studio 2010. Initially, I struggled and attempted various ways to resolve this and finally succeeded in resolving this. Please use this approach to resolve such NuGet errors.

I encountered an error as given below:

Could not connect to the feed specified at ""'. Please verify that the package source (located in the Package Manager Settings) is valid and ensure your network connectivity.

your network connectivity

There are a few steps recommended to resolve an error as shown below:

Step 1

Open the file devnev.exe.config at C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE.

Step 2

Take a backup of this file for precautionary purposes.

Step 3

Open this file and find system <System.Net> </System.Net> that you may see at the bottom of this file.

Step 4

Add the following segment into <> as shown below:

  1. <>   
  2.     <settings>   
  3.       <servicePointManager expect100Continue="false" />   
  4.       <ipv6 enabled="true"/>   
  5.     </settings>   
  6.     <defaultProxy useDefaultCredentials="true" enabled="true">   
  7.       <proxy usesystemdefault="True"/>   
  8.     </defaultProxy>   
  9. </>  
Step 5

Save and close this file.

Step 6

Reopen Visual Studio 2010.

Step 7

For finding the package, first we need to open the Package Manager Console. We can open it as in the following:


  • From the Tools menu.

  • Select "Library Package Manager".

  • Then select "Manage NuGet Packages for Solution".

    Manage NuGet Packages for Solution

  • Open the NuGet Package Manager and type your desire file name, for examle I specified NewtonSoft.Json.

    NuGet package manager

As soon as you have succeeded in downloading, a welcome message page is shown as in the following:

succeeded to download

I hope it will help to resolve your issue.