firewall settings

I had Comodo EasyVPN set up and working well to control my dad’s computer. Something changed and I can no longer use remote control, although chat still works fine. I have uninstalled and reinstalled and still no joy. I have looked at Comodo Firewall settings and have EasyVPN.exe, Vpnservice.exe and crdp.exe set as trusted applications on both machines. I can send the request, he clicks accept, but nothing happens.

Are these firewall settings correct and are there others I should look at?

Thanks in advance,