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 "https://nuget.org/api/v2/"'. Please verify that the package source (located in the Package Manager Settings) is valid and ensure 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 <System.net> as shown below:

<system.net>
    <settings>
      <servicePointManager expect100Continue="false" />
      <ipv6 enabled="true"/>
    </settings>
    <defaultProxy useDefaultCredentials="true" enabled="true">
      <proxy usesystemdefault="True"/>
    </defaultProxy>
</system.net>

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

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



I hope it will help to resolve your issue.

Thanks.