When you install the game on pc,turn off your protection program then once the game and playonline are 100% installed before you even lunch the game add them to your firewall list so they can by pass the firewall and work with out having to play with it. If you have questions how to do it just tell me what program you have protecting your computer and i can tell you how to do it.
btw there is 3 files you need to add and that is all. I had a rather easy time doing it my self but just the fact i remembered for years my buddys saying an update crashed there game and had to reload the game.
C:\users\user name\desktop\Final FantasyXI.ink
C:\program files (x86)\PlayOnline\SquareEnix\PlayonlineViewer\pol.exe
C:\users\user name\desktop\playonline.ink