Today registry.starmarde.org have some problems (the site is offline at the moment).
Actually the only way to know that is to succeed to load the forum page and it's warning banner. But nothing warn the player when he try to launch update from the StarMade-starter.exe or starmade-launcher.exe. He just got a vague socket exception warning message (which can be provoke by mutiple causes, i.e. firewall options, etc.).
May it worth to add a simple line in launchers which inform about registry server status : green-online / red-offline.