Anyone concerned about their ports being unstealthed can check with Gibson’s Shields Up GRC | ShieldsUP! — Internet Vulnerability Profiling I’ve used this for over 15 years. It’s a free service. It probes your firewall for port vulnerabilities. You can choose all service ports (the first 1055 ports) or custom port ranges. The problem is, according to SoulAsylum, N360 is using various ports, some of which may be above Port 1055. Gibson offers other probes as well, e.g. file sharing (networking) status, UPnP exposure etc.
Results of port probe:
Results of file sharing/networking probe:
Get more info about TCP and UDP ports here: List of TCP and UDP port numbers - Wikipedia