If you are receiving this error, it may mean that something on your system is not allowing Fallen Earth to connect to the internet. Presuming you are indeed connected to the internet and can surf elsewhere normally, the first thing to do is to make sure you are running FEUpdater.exe as administrator (right-click and select "Run as administrator"). If this doesn't help, make sure that FEUpdater.exe and frontend.exe are added to the exceptions list for both your firewall and anti-virus software. You may also wish to reboot your modem. If you are using a router, you may have to open ports 3000-3020 and 80; please consult your router manufacturer for more information.
If you continue to experience issues, you may send a report of everything you've tried along with a DXDiag to us for further assistance.