New Post: error when using NuGet.exe in offline server (with no internet)

Hi,
I have a local nuget server on a local server in our enterprise and it's blocked to the internet.
I need to build packages using NuGet.exe (command line tool) into a local feed and not into nuget repository (security considerations , etc).
I'm getting the following exception
"The remote certificate is invalid according to the validation procedure"
when trying to execute the following on command line:
NuGet.exe spec
Is there ability to support a local server while working with the command line tool?