I work in a rented office space, and they provide all internet services. Whenever I connect to the provided (wired or wireless) network, I am unable to query MongoDB using the C# driver, but other tools work just fine (e.g., MongoVUE). I have examined the server logs (with verbose on, and "vvvvv" turned on), and no errors or exceptions are reported. The document requested is found and returned; however, the C# driver just hangs. If I point to a local instance of MongoDB or connect to a different network (such as my home network), everything works as expected. I have noticed that disabling the "Visual Studio hosting process" fixes the problem for regular executables, but unit tests (from Visual Studio) still fail on the office network. I would be happy to submit a memory dump if it would help and if it will be treated privately and not made public.