On few occassions you may encounter an issue wherein the nUAG appliance when started and joined to the domain for the first time will take long time to start and when it starts the MS Firewall service stays in "starting" state. This problem occurs mostly when user has not followed the quick start guide properly and continued with the steps one after the other. Two ways to resolve it;
#1 If you have already configured the nUAG appliance and now the MS Firewall service is not starting.