Unableto create new net network

I have created a network a number of times, IP range. Then used the stealth wizard. Every time a reboot the new network is lost, where there is an apply this is used so I am rather lost as to what’s going wrong?
I am doing this as desk PC can be accessed over the network but can’t access the laptop using comodo (it used to but had problems replacing a network modem/router yesterday) so I trying to ensure comodo isn’t blocking incoming access.