[Mark McLeod]

Turn off your firewall and any anti-virus or third party firewall management software to see if that's what's blocking the mDNS resolution.

BTW, It's not that you can't use a firewall, it's just that it takes some effort to setup any required exceptions, and just turning off the firewall is often easier for most people.
When the software gets installed sometimes people make the wrong choices, like don't trust this software, make this a public network instead of Home, etc.

Also the robot network should be treated as a Private or Home network if Windows asks (ot a Public one which is more restrictive).