Ralf, when I followed your instructions, including going back through and using a server.domain.tld fqdn, it does not work. As the target environment uses Chrome exclusively - not under my control - then it has to work with the latest Chrome.
This isn’t a must-have project. I simply wanted to move some apps being hosted externally onto an internal server in order to improve performance. This is a rural location that’s lucky to get 4-5MB downlink speeds. And, I need that server to be drop dead simple to administer.
As I just replied to Dan, I’m going to switch the server to ns7. If it has tools to solve this out of the box, then I’ll stick with ns7. If it doesn’t, then I’ll consider NethServer to not be viable due to failure to support current browser standards and look elsewhere. It’s not that I have better things to do - just that I have things I can do better these days.