I've read people having problems with the connection Recently, Fly For Hero upgraded to V14..
Which means, you need a V14 Client
Here are 2 mirrors :
Massacred
Megaupload
Simply Download & Install.
The make sure u got the patcher :
Click
Put it into your installed V14 folder.
Delete flyff.a
Run Flyff.exe and let it update.
Now you are free to go <3.
Hope i helped.
NOTE:
If you're smart, and want ur old configuration, copy ur old neuz.ini and paste it in the FlyForHero's folder..
MAKE SURE U REMOVE the IP
as in; in neuz.ini you got :
IP "ipofsomeserver"
Make it :
ip""
Save and close <3.