No, it isn't caused by an IP Ban, actually, Z8Games crossfire just implemented a new IP Restriction system, which now blocks new created accounts that are outside of the map below, to be restricted from playing. Any other accounts created before this date is fine, but any accounts created after the update is good.
[IMG]http://i398.photobucke*****m/albums/pp69/g4box/misc/World-Map-Worksheet-ipblock-3.png[/IMG]