Verify your installation location (Hard Drive) has sufficient space to accept the data.
Start Fallen Earth and from the first screen you see click on "Defragment Game File System".
Then if needed, restart Fallen Earth and select "Perform Complete File Check" and proceed with login.
If issues persist, make sure that FEUpdater.exe and frontend.exe (located in your main Fallen Earth directory) are added to the exceptions list for both your firewall and anti-virus software. If this doesn't solve the issue, try disabling the program only long enough to see if the results change. If this doesn't help, try closing down all other applications like Instant Messaging, Voice over IP, active virus scanners in case they are causing interference. 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, Ping Test and Tracert to us for further assistance.