I had a similar situation with my imaging tool running Windows 10 and returning that error. I am assuming you are on Windows 10. This could be an mDNS issue. This was my explanation for the network resolution that fixed the both the radio config problem and the error the rio imaging tool was throwing. It was the same error message as yours.
http://www.chiefdelphi.com/forums/sh...d.php?t=141688
I am having lots of problems this year with my laptops connecting with my radios. There are lots of reboots. It might be some sort of ARP table problem or cached IP addresses somewhere. Power off your laptops and rio and start clean.