After testing out many proxy and vpn softwares including proxifier, proxyfirewall, widecap, OpenVPN and AOL, only to find out none of them work, I have successfully configured a software called proxycap to play vindictus.
Today I have been using proxycap to play Vindictus for a few hours without any hack messages or dc problems. For all you people outside the US, heres how i did it.
Download the old HS file provided somewhere in this forum, then replace ONLY your new HS files AhnRpt.exe and HsLogMgr.exe with the old ones found in the file that you downloaded.
If you haven't already downloaded Proxycap, download it. Google is your friend
Find yourself a US Socks 5 proxy, and add it to Proxycap in your preferences.
To do this, go to the proxy section on the left and click the new proxy icon.
Then configure a rule for Vindictus.exe using your proxy.
At the left side of your preferences select rules and click the new rule icon.
Select Vindictus.exe and the proxy that you have added.
Make sure your Proxycap is still disabled (the icon will be grayed out in your taskbar)
Login to the Vindictus website and launch it.
Once at the startup screen, (where the boat is) enable your Proxycap
(the icon will turn purple) and start the game.
If you want to access the marketplace, you can disable Proxycap once you have logged in. You won't dc.
Hope this helps all of you, it works fine for me