New Post: Source control, Package restore, Offline network

Here is our development environment description:

1. Working with Source control, means the packages are NOT stored into the source control.
2. (that leads to) Package restore at build time.
3. The network is offline, means NOT connected to the internet.
4. Release build server with automated release build process.
   

What I have done so far:

1. Established a local network repository with all the packages we use.
2. Configured vs 2012 in Tools->Options->Package Manager to "Allow nuget to download..." and the path to the packages repository.
3. Updated Nuget package manager to version 2.2 by downloading it's vsix file and installed it directly.
   

the problem:
When I execute the "Enable Nuget Package Restore", I always get the message telling me that the remote name could not be resolved "Nuget.org".

It looks like "Enable Nuget Package Restore" is trying to go online to update something...

Any Idea ?