Nowadays it is common that some people attack a specific Metin2 vulnerability, then they request a payment to "fix the problem". Here we share that fix for free: https://dl.vps4you.hu/public/Metin2/input.cpp

Also, extra firewall protection available for our customers to protect against this kind of attacks. You only have to ask it in a Message/ticket, giving us the ports used by your metin2 server.

This fix and our protection cannot protect your server from every type of attack, there are a lot of Metin2 source code fix on the internet that fixes different problems in the Metin2 server, which can stop your server, or it can even delete your whole VPS through this Metin2 source code problem.

You also should use ipfw on your VPS, for it we have an ipfw firewall script that is working: https://dl.vps4you.hu/public/Metin2/ipfw.rules

To protect your website, you should use Cloudflare.