Worse was when I had somebody adding the ip address as an Inet4Address on every message passed between machines in a production environment that explicitly didn

Worse was when I had somebody adding the ip address as an Inet4Address on every message passed between machines in a production environment that explicitly didn't have DNS (banks have occasionally very odd ideas about securing subnets). Every single message was doing a reverse DNS lookup and then timing out. And there were a _lot_ of messages.