Restauración de Nuget a través del servidor de compilación "no se puede encontrar la versión"

Tengo una solución VS y, como parte de TeamCity Build, restauramos paquetes de un feed NuGet privado (myget) y del feed público (nuget.org). La mayoría de los paquetes se restauran bien, pero se cuelga de los siguientes para WebApi y Mono.Security. Todo esto funciona localmente en Visual Studio.

[restore] NuGet command: C:\TeamCity\buildAgent\plugins\nuget-agent\bin\JetBrains.TeamCity.NuGetRunner.exe C:\TeamCity\buildAgent\tools\NuGet.CommandLine.DEFAULT.nupkg\tools\NuGet.exe restore C:\TeamCity\buildAgent\work\953bd084b49f7d88\DataFinch.Web.sln -Source https://www.myget.org/F/datafinch/auth/<hidden>/api/v2 -Source https://api.nuget.org/v3/index.json
[11:41:35][restore] Starting: C:\TeamCity\buildAgent\temp\agentTmp\custom_script473789219385667038.cmd
[11:41:35][restore] in directory: C:\TeamCity\buildAgent\work\953bd084b49f7d88
[11:41:35][restore] JetBrains TeamCity NuGet Runner 8.0.37059.9
[11:41:35][restore] Registered additional extensions from paths: C:\TeamCity\buildAgent\plugins\nuget-agent\bin\plugins-2.8
[11:41:35][restore] Starting NuGet.exe 2.8.50926.602 from C:\TeamCity\buildAgent\tools\NuGet.CommandLine.DEFAULT.nupkg\tools\NuGet.exe
[11:41:43][restore] Unable to find version '5.2.3' of package 'Microsoft.AspNet.WebApi.Client'.
[11:41:43][restore] Unable to find version '5.2.3' of package 'Microsoft.AspNet.WebApi.Core'.
[11:41:43][restore] Unable to find version '3.2.3.0' of package 'Mono.Security'.
[11:41:43][restore] Unable to find version '6.0.4' of package 'Newtonsoft.Json'.
[11:41:43][restore] Process exited with code 1

Configuración de Teamcity:

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