"Login Server Shutdown" and Port Security on Knight Online Servers
In Knight Online pvp servers, the first stop where players see the server list and ID/Password verification is done when entering the game. LoginServer.exe module. Attackers can lock this module and completely block access to the game by overloading the Login Server port with bot accounts or DDoS software. Here are the security measures you can take to prevent the entrances from being blocked.
Step 1: Changing and Hiding Login Server Port
Default login port of Knight Online pvp servers 21000is. Since this port is known to everyone from the outside, it is directly targeted:
LoginServer.iniOpen the file andPORT=21000Change the default value to a unique external port number.- You can use the same port number in the pack (Client) you distribute to the players.
server.iniAlso define it in the file. Making the port non-standard will automatically block most bot attacks.
Step 2: Limit Connections with Windows IPSet and TCP Connlimit
A cyberattacker can crash the Login Server by sending thousands of fraudulent login requests per second from a single IP address. To prevent this, you should apply the following rule in your server-side firewall software or Windows advanced firewall:
- Maximum simultaneous connection limit (TCP Connlimit) that can come from a single IP address at the same time to your input port (Ex: 21000). 3 or 5 Limit to .
- A normal player only opens 1 connection per second when entering the game. In this way, attacker IPs that send hundreds of requests per second will be automatically blocked (dropped) by the system.
Step 3: Log Cleanup and Regular Automatic Restart
Login Server writes every incorrect login attempt and connection request to the log table. Bloated logs reduce exe performance:
- on SQL Server
TB_USER_LOGor similar entry tracking tables at regular intervals (weekly cleaning). - If necessary, use Windows Task Scheduler to ensure that LoginServer.exe is automatically closed and restarted every night when the number of players is lowest (Ex: 05:00).
This article is specially prepared for PvPServer.
