Hi,
Please check your Windows 10 machine's firewall, it could be that something is globally blocked from access and that is the reason why it's not accessible. Why it works with DNS - I'm not sure, but this requires some testing to be done anyways.
If there's a possibility to connect RUTX12 to another Windows 10 PC - do that too, as it will show if it's the issue only with the current machine or it's an issue within RUTX12 itself.
Regarding the firewall suggestion - you can totally shut it off and see if anything changes, if not - turn it back on.
EB.