Today the Lineage II update servers were moved to Dallas as part of our data-center relocation. Because of this move, some users may difficulties connecting to the patcher. This can easily be fixed by following these simple steps:
Close the patcher.
Click on the Start button in your Windows interface.
Click on Run.
Inside the text box, type "cmd" and press Enter.
Inside the black command prompt box, type "ipconfig /flushdns".
After the process is finished, restart your patcher.
By doing this, players should be able to connect to the game with no further problems.