[This is preliminary documentation and subject to change]
The Status method of the IIsFtpServer object returns an integer that indicates the current status of the server. The possible values are 1 (starting), 2 (started), 3 (stopping), 4 (stopped), 5 (pausing), 6 (paused), or 7 (continuing).
IIsFtpServer.Status
Start, Pause, IIsFtpService, Stop