And this is going to get flamed
Yet again, the "benefit" of unencrypted TCP/IP everywhere, depending upon firewall and gateway rules, shows itself.
I think the world would have been better off sticking with an non-routable protocol with interpretive gateways only when and where needed. Yes, Yes, it would have added overhead, but 20+ years later we're all paying, quite dearly, for the convenience with the inherent lack of security. There's more to it than that, of course, but you need to start somewhere.