I have a few Intel NUC’s running Ubuntu 20.04 LTS or Debian 11 that I used as headless music servers across various locations. They all run JRiver Media Center 27 that I control via JRemote on either an Android phone or iPad, each on their own local network. They are only used on the local network; never from an external site, nor do I use VPN on these systems. Oddly, none now function and the JRemote error shows it “Timed out” on the appropriate address pointing to a firewall issue (same for all OS combinations). Disabled the firewall on the pc(s), but still the same issue. Thought the controlling device (certificate?), but both iPad and Android device fail with the same issue. Checked the router log and no mention of port blocking (as expected with Skynet, the only addon I use). I suspect the devices are no longer permitted to talk to one another on the same network and know the guest networks have been “upgraded” since I was on 384.19, when they all worked. Is this issue from an unknown-to-me router setting or am I missing something else?