Socket Listening Error

I had a Visioneer scanner loading and functioning properly, but have changed to an HP ScanJet. I have tried two different models, 4670 and 5470c, and verified that I have the latest TWAIN drivers. The XPe device can see the scanner, but RemoteScan gives me the "SOCKET LISTENING ERROR." I have also reloaded RS after installing new drivers. Anything else I should try?