OK, there are some seriously worrying words in there, starting with “The C drive cannot be shared with the network”!
For starters, you never share the C: drive of a server. Never at all. The level at which this request is starting makes me wonder if this is something as simple as the Kolibri web server not having been unblocked on the server’s firewall? I’m at this stage inclined to hazard a guess that the connectivity issues are related to Windows Server, and not Kolibri. Also, Server 2008 R2 will become unsupported in January 2020, so is not a good platform on which to build.