VSTS: nuget.exe failed with return code: 1 Packages failed to restore

Question

I am new in Visual Studio 2017 and was trying to build using Visual Studio Team Services. I am getting the following error:

System.AggregateException: One or more errors occurred. ---> NuGet.Protocol.Core.Types.FatalProtocolException: Failed to retrieve information about 'Microsoft.AspNetCore' from remote source 'http://nuget.ohyeah.net/api/v2/FindPackagesById()?id='Microsoft.AspNetCore''. ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The remote name could not be resolved: 'nuget.ohyeah.net'

I was googling to make sure I know why exactly this error happens but no luck yet. A sample stack trace can be found here: https://pastebin.com/RiGmd7Cd

What could be the reason, is it because of some settings in Nuget.Config? It looks exactly like below:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <activePackageSource>
    <add key="All" value="(Aggregate source)" />
  </activePackageSource>
  <disabledPackageSources />
  <packageSources>
    <add key="3rdparty" value="http://nuget.XXX.net/api/v2/" />
    <add key="official" value="http://nuget.XXX.net/api/v2/" />
      <add key="vsts-official" value="https://XXXXXX.pkgs.visualstudio.com/_packaging/Official/nuget/v3/index.json" />
    <!--<add key="local" value="C:\inetpub\wwwroot\Packages" />-->
    <add key="microsoft" value="https://www.nuget.org/api/v2/curated-feeds/microsoftdotnet/" />
    <add key="nuget.org" value="" />
  </packageSources>
</configuration>

I am stuck on this, any help would be highly appreciated.

Answer 1

First, check nuget.ohyeah.net can be accessible from build agent.

Secondly, you need to check Nuget.config file whether https://api.nuget.org/v3/index.json is in the package sources, if not add it:

<packageSources>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
  </packageSources>

1. Project root folder if it existing in.
2. The Nuget config file if you specified in NuGet Restore task
3. Build service user folder on build agent(%appdata%\\Nuget)

BTW, the code you provided is not for Nuget.Config, it is NuGet package file.

Answer 2

It looks like you have a package source configured somewhere. Either in VSTS or a Nuget.Config. Based on the log, you have a custom source ' http://nuget.ohyeah.net/ ' which is not a valid nuget feed. If you have more details about your configuration, it would be easier to assist.

Answer 3

The problem was mixing the old TFS xml formatted resource and json formatted VSTS resources. So, in this particular problem, VSTS will always look for id to be matched in a json file to match to a nuget package, then VSTS will try to retrieve the nuget packages. If you have old TFS nuget repositories, you have to create an entry in a json file. In my case, I had to remove the old TFS packageSources like http://nuget.XXX.net/api/v2/ from Nuget.Config. Also, you need to create a valid @id , @type dictionary entry in your new json file, in my case it is: https://XXXXXX.pkgs.visualstudio.com/_packaging/Official/nuget/v3/index.json . Now, the working version looks like below:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <activePackageSource>
    <add key="All" value="(Aggregate source)" />
  </activePackageSource>
  <disabledPackageSources />
  <packageSources>
      <add key="vsts-official" value="https://XXXXXX.pkgs.visualstudio.com/_packaging/Official/nuget/v3/index.json" />
    <add key="microsoft" value="https://www.nuget.org/api/v2/curated-feeds/microsoftdotnet/" />
    <add key="nuget.org" value="" />
  </packageSources>
</configuration>

Answer 4

The easiest solution to this just change version of NuGet package as shown below. I have faced the same issue when NuGet restore searching for V 3.3.0. It was there, I used it I hosted agent. I found this have worked for me.