I have a customer that routinely connects to an ECS from her PC via the network. Today she's getting a 'Connection refused' error. I asked her to open a DOS window and ping it, the ECS is responding and sending a reply. I think I have may experienced this once at a customer's site - but if I recall correctly next time I was there it was OK.

Any idea of what can cause the 'Connection refused' message? I believe last time this customer had the trouble she rebooted her PC, then was able to get it. That's not the case this time.