This morning I submitted this feedback/feature request. Please, all those who agree that this is necessary, add your feedback remarks somehow.
The error message about a remote host being unavailable could also say: "You should also check your Internet connection to be sure you are online."
I HATE GETTING PHONE CALLS FROM PEOPLE WHO DO NOT KNOW THAT THEIR LAPTOP OR MOBILE DEVICE DOES NOT (YET) HAVE AN INTERNET CONNECTION AND THEY THINK THAT FILEMAKER SERVER IS NOT RUNNING !!!
Please, FMI, this doesn't require new engineering!