title: TeamCity not restoring NuGet packages from particular package source
body: <p>I have recently added a bunch of Sitecore NuGet packages to my solution from their new NuGet server: <a href="https://sitecore.myget.org/F/sc-packages/api/v3/index.json" rel="noreferrer">https://sitecore.myget.org/F/sc-packages/api/v3/index.json</a></p>
  
  <p>But TeamCity doesn't seem to be able to download these:</p>
  
  <pre><code>[12:45:16][restore] Unable to find version '8.1.160302' of package 'Sitecore.ContentSearch.Linq.NoReferences'.
  [12:45:16][restore] Unable to find version '8.1.160302' of package 'Sitecore.ContentSearch.NoReferences'.
  [12:45:16][restore] Unable to find version '8.1.160302' of package 'Sitecore.Kernel'.
  [12:45:16][restore] Unable to find version '8.1.160302' of package 'Sitecore.Kernel.NoReferences'.
  </code></pre>
  
  <p>I have amended the list of packages sources in my 'NuGet Installer' build step so that the Sitecore source is the only one, but yet it still can't restore these .dlls. <em>(As a side note: I would have expected other packages to now fail because their source has been removed, but there is no error for those?)</em> </p>
  
  <p>Looking at the logs, I can see the command being fired, which looks correct:</p>
  
  <pre><code>C:\TeamCity\buildAgent\tools\NuGet.CommandLine.2.8.6\tools\NuGet.exe restore C:\TeamCity\buildAgent\work\52ce411043f6b04c\MySolution.sln -Source https://sitecore.myget.org/F/sc-packages/api/v3/index.json
  </code></pre>