Reproduction steps:
1) Download and open attached project
-- Notice that Win32Exception: Success is being thrown.

Steps to reproduce this issue on an empty project:
1) Create new project
2) Go to Player Settings and change Scripting Runtime Version to Experimental (.NET 4.6 Equivalent)
3) Go to Preferences/Cache Server and change Cache Server Mode to Local
-- Notice that Win32Exception: Success is being thrown.

Note: After cleaning console, do any action that updates cache server (for example reimport assets) and you will get the same error

Reproduces only on Mac (tested with Mac and Windows)
Reproduces with many platforms (tested with Android, iOS, Standalone and WebGL)

Reproduced with:
2017.1.0b1, 2017.1.0f1

2017.2.0b1 does crashes with .NET 4.6