Is there a configuration option to prevent a call to nuget.org when a script is executed?

[surfmuggle]

Due to other issues with my setup i noticed that at the start of running a script NetPad tries to connect to nuget:

NuGet.Protocol.Core.Types.FatalProtocolException: 
    Unable to load the service index for source https://api.nuget.org/v3/index.json.
    ---> System.Net.Http.HttpRequestException: The proxy tunnel request to proxy 
         'http://user:[email protected]:8080/' failed with status code '502'."

I am aware that the cause for FatalProtocolException has nothing to do with NetPad. But i wonder if there is an option to disable / prevent the callout to nuget.org during a script execution.

Is there a configuration option to prevent a call to nuget.org when a script is executed?