Game Server Security: Best Practices to Protect Your Server

Running a game server makes you a target. DDoS attacks, unauthorized access, griefing exploits, and data theft are real threats that can ruin the experience for your entire community. The good news is that most attacks exploit basic vulnerabilities that are straightforward to defend against. These best practices will help you protect your server, your players, and the world they have built together.

DDoS Protection

Distributed Denial of Service attacks are the most common threat to game servers. Attackers flood your server with traffic to make it unreachable. Motivations range from competing server owners to disgruntled banned players.

How to Defend Against DDoS

Choose a host with built-in protection. The most effective DDoS mitigation happens at the network level, before attack traffic reaches your server. At Reactor, all servers run behind Cloudflare infrastructure that automatically detects and filters malicious traffic.
Do not expose your server’s real IP. If attackers know your server’s direct IP address, they can bypass network-level protections. Use a hosting provider that handles this for you.
Hide your IP from players. Avoid sharing the server’s raw IP in public Discord channels or forums where attackers might find it. Use the connection details provided by your hosting dashboard.

Recognizing a DDoS Attack

Symptoms include sudden connection timeouts for all players, extremely high ping, and the server becoming unresponsive. If your hosting provider has DDoS protection, the attack should be mitigated automatically. If you are on unprotected hosting, there is little you can do except wait it out or switch providers.

Access Control

Controlling who can access your server and what they can do is fundamental to security.

Server Passwords

For games that support server passwords, always set one for private servers. Games like Valheim, Enshrouded, and Palworld support password protection that prevents unauthorized players from joining. Use a strong password and only share it with trusted players.

Whitelisting

Many games support player whitelists that restrict access to approved accounts only. This is more secure than passwords because each player is individually verified. Minecraft has built-in whitelist support, and most other games offer it through server configuration or mods.

Admin and Operator Permissions

Be extremely selective about who gets administrative privileges on your server. Admin access typically includes the ability to:

Ban and kick players
Modify server settings
Spawn items and resources
Access the console
Delete world data

Only grant admin access to people you trust completely. A rogue admin can destroy months of community progress in minutes.

RCON Security

Remote Console (RCON) allows server administration through a network connection. If your game supports RCON:

Set a strong RCON password. Never use the default or a simple password.
Restrict RCON access. If possible, limit RCON connections to specific IP addresses.
Disable RCON if unused. If you manage your server through a web panel or SFTP, disable RCON entirely to reduce your attack surface.

SFTP and File Access Security

SFTP (Secure File Transfer Protocol) is used to upload mods, edit configuration files, and manage your server’s file system. Securing SFTP access is critical.

Use strong credentials. Your SFTP password should be unique and complex. Never reuse passwords from other services.
Do not share SFTP access broadly. Only server administrators should have file-level access. Players who need to upload resource packs or mods should send files to an admin rather than getting direct access.
Review uploaded files. Before installing mods or plugins from untrusted sources, verify their authenticity. Malicious server mods can contain backdoors that give attackers control of your server.

Keeping Your Server Updated

Outdated server software is one of the easiest targets for attackers. Game developers regularly patch security vulnerabilities, and running an old version leaves those vulnerabilities exposed.

Update Best Practices

Update promptly. When a new server version is released, update within a reasonable timeframe. Security patches should be applied quickly.
Back up before updating. Always create a backup before applying updates. If an update causes compatibility issues with your mods, you can roll back to the previous state.
Test on a staging server. If you run a large community server with critical mods, test the update on a separate instance first to verify compatibility.
Update your mods too. Outdated mods can contain vulnerabilities or cause instability with newer server versions. Keep your mod list current.

Anti-Cheat and Exploit Prevention

Cheating degrades the experience for legitimate players and can drive your community apart. Different games handle anti-cheat differently, but there are universal practices.

Server-Side Validation

Games that validate player actions server-side are inherently more resistant to cheating. Games like Rust, DayZ, and ARK: Survival Ascended include server-side anti-cheat systems. Make sure these are enabled in your server configuration.

Monitoring Player Behavior

Active moderation catches exploiters that automated systems miss. Look for:

Players with impossibly fast progression
Unusual item quantities
Movement anomalies (speed hacks, teleportation)
Resource duplication patterns

Games like Minecraft have anti-cheat plugins (NoCheatPlus, Vulcan) that automate detection. For other games, regular log review and community reporting are your best tools.

Ban Management

When you identify cheaters or malicious players, ban them promptly and permanently. Most games support banning by account ID rather than just IP address, which prevents circumvention through VPNs. Maintain a ban list and consider sharing it with other server administrators in your game’s community.

Backup Strategy

Backups are your last line of defense. When everything else fails, a recent backup lets you recover.

Automated Backups

Configure automated backups on a regular schedule. Daily backups with seven days of retention give you enough history to recover from most incidents. At Reactor, automated backups are included with every server plan.

Manual Backups Before Changes

Before installing mods, updating the server, or making significant configuration changes, trigger a manual backup. If the change breaks something, you can restore immediately instead of waiting for the next scheduled backup.

Test Your Restores

A backup that you cannot restore from is worthless. Periodically test the restore process to confirm your backups are valid and complete. Know the steps to restore before you need to do it under pressure.

Network Security

Minimize Open Ports

Only expose the ports your game server needs. Every open port is a potential attack vector. A Minecraft server needs port 25565. A Valheim server needs ports 2456-2458. Do not open additional ports unless a specific feature requires it.

Monitor Connection Patterns

Unusual connection patterns can indicate reconnaissance or attack preparation. A sudden spike in connection attempts from diverse IP addresses might be a DDoS ramping up. Unusual login attempts might indicate someone trying to brute-force admin credentials.

Building a Security-First Community

Security is not just technical. It is cultural. Establish clear rules for your community:

Publish server rules that prohibit exploits and cheating
Designate trusted moderators who can act when administrators are offline
Create a reporting system for suspicious behavior
Communicate openly about security incidents and how they were resolved

A community that takes security seriously attracts better players and retains them longer.

Start Secure

At Reactor, security is built into the infrastructure. Every server runs on enterprise hardware behind Cloudflare DDoS protection, with isolated containers ensuring no other customer can access your server’s resources or data. Automated backups, SFTP access, and a web console give you the tools to manage security without complexity.

Explore the game catalog and start hosting with security built in from day one.