Just thought I’d add my 5 cents. If you add a new hard-drive, the SKI remote plug-in might disappear!
This happened to me a while ago. IC pro, suddenly, connect. It claimed that there was no computer on the network. I found this strange. Everything else, including the iPad itself, worked perfectly over the Wifi network.
That the SKI remote plugin could be erased by installing a hard-drive, didn’t enter my mind. Also, the error message, indicated that there was something wrong with the network. It should have said that it couldn’t find a SKI remote plugin, not that there was no computer!
After a while I noticed that the SKI remote was missing in the Remote Devices pane. I reinstalled it, and IC pro worked perfectly.
So…if IC Pro suddenly can’t connect, have you installed some (seemingly totally unrelated) hardware?