When the connection between Server and Client is broken you can see messages like this in the USB over Network Client:
There may be various reasons of this. First, check if two PC’s are accessible from each other. If there’s a router, please make sure that the port forwarding is configured correctly. Also, make sure your firewalls (both software and hardware), antiviruses or any other software is not blocking the connection. Finally, make sure the versions of the Client and the Server are the same.