If a timeout or cancellation request happens AFTER `socket.Connect` returns but BEFORE the `connected` variable is set to true the socket could be Closed before the Connect helper method returns:

https://github.com/mongodb/mongo-csharp-driver/blob/v2.10.0/src/MongoDB.Driver.Core/Core/Connections/TcpStreamFactory.cs#L144

The window for the race condition is VERY small and therefore low probability.