Well i was reading some threads and i saw lot of you get d/c when using the public hack so i checked that the "Hack Shield" detect it after 10 mins of playing so here is the fix
Well First Step open: C:\Nexon\Combat Arms\HShield
Select all the .dll files and move them to another folder move also "Update" Folder and HSUpdate, HSUpdate.env
Its very important to take out all this files WHILE YOU ARE IN THE LOG IN SCREEN or the game wont run.After that your not going to get D/c while using the hack.
To play again the game move all the files back to C:\Nexon\Combat Arms\HShield when the game open just take them out again.
Credits go to : My Computer Teacher
Hope it works