I havent read all the responses so it may have been mentioned but. If you have a windows firewall or another firewall enabled you will need to ensure it allows the traffic IN on both machines.
If you switch off the windows firewall on both machines this will temporarily tell you if they communicate. Don`t be connected to the internet while you do this as you will be exposed. If it works then you will need to re-enable the firewall and find the ports used by the software and create explicit rules.
If you switch off the windows firewall on both machines this will temporarily tell you if they communicate. Don`t be connected to the internet while you do this as you will be exposed. If it works then you will need to re-enable the firewall and find the ports used by the software and create explicit rules.