Local port not connected is a new one on me. Is that the exact error message? And if so, whats actually giving you the error? Is it a windows box, or is that a message in RSLinx or RSLogix? Are you getting it when you try to auto-configure? The closest I've seen is a message that the port was not available. I think that came up in a windows error box and it always meant I had another program currently tying up the port, or the port was actually bad (that only happened once).