We just upgraded a .net Core application with Visual Studio 2017.
The problem is that restoring packages fails in the VSTS build.
This is because VS2017 requires nuget version 4.x and this is not yet available in VSTS.
I have tried the custom version option but that gives an error.
Restoring nuget packages fails with 401
Trying to push to VSFS/git returns error 400
VS2017 Enterprise Installation Problem