* Make sure your client is version 1.9 (see version.ini file in Aion directory)
* Make sure the client is set to North American region
* Make sure your client has the IP-restriction removed (if you are uncertain, download the attached 'd3dx9_38.dll' and copy it to your Aion\bin32\ folder)
well you can find the .dll on our forum (Important Stuff-> How to connect)