How to Protect Your MTA:SA Server Against DDoS Attacks

If you run an MTA:SA server, a DDoS attack is not a possibility — it is something you will eventually face. The Multi Theft Auto community is competitive: rival server owners, banned players, or people doing it purely for entertainment can make your server unplayable within minutes. The good news is that protecting an MTA:SA server against DDoS attacks is entirely achievable once the right layers are stacked on top of each other. This guide starts with how the attack arrives, then walks through three separate lines of defence: the network, the server itself, and your MTA configuration.

Why MTA:SA Servers Become DDoS Targets

When a website is under attack, pages load a few seconds late and most visitors never notice. Game servers are different: MTA:SA exchanges position and movement data dozens of times per second. Even 200 milliseconds of added latency breaks vehicle handling, teleports players around the map, or drops the connection entirely. In other words, an attacker does not need to take your server down — disrupting it is enough.

MTA:SA servers are also convenient targets:

• The IP address is public by design. Your server is listed in the official browser, and players need a visible IP and port to connect.
• Traffic runs over UDP. UDP sends data without establishing a connection, which makes spoofing source addresses straightforward.
• The community is small and competitive. With a limited player base, a few hours of downtime means players migrate to a rival server.
• Attacks are cheap. Attack-for-hire services are widespread and require no technical skill to use.

MTA:SA Network Layout: Which Ports Are Exposed?

Before building a defence, you need to know what you are defending. A default MTA:SA server uses three separate doors:

Game port (22003/UDP by default)

Actual gameplay traffic flows here — player positions, shooting, vehicle movement, and synchronisation packets. Most attacks aim directly at this port, because every millisecond of delay here is immediately felt by players.

Query / ASE port (22126/UDP by default)

This port makes your server visible in the in-game server list, returning the server name, player count, and map information to anyone who asks. The problem is that it produces a large response to a small request. An attacker can spoof the source IP to turn this port into an amplification tool, or simply send thousands of queries per second to exhaust your CPU. In practice this is the weak link that gets overlooked most often.

HTTP port (22005/TCP by default)

When a player first connects, scripts, models, and sound files are downloaded through this port. Because it is TCP, it is exposed to SYN flood style attacks. When this port is saturated the server stays up, but nobody can get in — players hang on the download screen. From the outside the server looks healthy while the flow of new players has stopped completely.

Common Attack Types Against MTA Servers

UDP flood

The bluntest method. Random UDP packets are sent at the game port in volumes that exceed available capacity. Once the link saturates, legitimate game packets sit in the queue and players experience rubber-banding, lag, and disconnects. Even if your CPU is idle, there is little you can do locally — this type of attack must be stopped on the path to your server, not on the server itself.

Amplification attacks

The attacker sends small requests with a spoofed source address to open DNS, NTP, or similar servers on the internet. The responses are delivered to your IP, and the resulting traffic is many times larger than what the attacker sent. MTA's ASE query port can be abused with the same logic.

Query flood

This targets processing power rather than bandwidth. Server information queries are sent continuously to the ASE port. The link never fills up, but the server must generate a response to each query, so the CPU saturates and the game loop slows down. This is the classic reason players report "the server is stuttering" while your bandwidth graphs look perfectly normal.

Application layer and resource abuse

Some attacks send no packet flood at all. Instead they repeatedly call a badly written script, a command that allows unbounded database queries, or an expensive event trigger, exhausting resources from the inside. Technically this is abuse rather than DDoS, but the outcome is identical. For a deeper breakdown of attack layers, see our comparison of Layer 4 and Layer 7 DDoS attacks.

Building Protection Layer by Layer

This is not a problem solved by a single setting. Effective protection consists of three complementary lines.

Layer 1: The network side (the critical one)

Volumetric attacks must be scrubbed on the provider's network, before they reach your server. If your uplink is saturated, no firewall rule running on the machine will help — the packets are already at the door. This is why DDoS-protected network infrastructure is a baseline requirement for game hosting, not a marketing line.

Questions worth asking a provider:

• Does the protection cover UDP traffic? Many protection products are designed for web traffic (TCP/HTTP) and offer limited benefit to a game server.
• Is filtering always on, or does it engage only after an attack is detected? With reactive systems, the first minutes are lost.
• Can you reach the support team during an attack? Support that replies during office hours is useless for an attack starting at 03:00.
• Is the server location close to your player base? For a community playing from Turkey, an overseas location adds a latency penalty even when no attack is happening.

At Nubitro, game servers are provided from the Istanbul location with DDoS-protected network infrastructure, 1 Gbps unmetered traffic, and 24/7 support. You can review the MTA server packages, or if you prefer to manage your own installation, the AMD Ryzen 9 9950X based Turkey VDS options.

Layer 2: Server-side firewall

This is where you clean up whatever residual traffic gets through. Baseline measures you can build with iptables or nftables on Linux:

1. Close every unused port. Set the default policy to DROP and open only the game port, HTTP port, query port, and SSH.
2. Rate limit per source IP. Use the hashlimit module to cap how many UDP packets a single IP can send per second. A normal player never comes close to that ceiling.
3. Drop malformed packets. Filter out packets with INVALID connection state and abnormally sized UDP datagrams at the very start of the chain.
4. Change the SSH port and disable password login. Move to key-based authentication. It seems unrelated to DDoS, but it is the second door attackers try most often.
5. Limit new connection rates. Capping new TCP connections to the HTTP port per minute significantly reduces SYN flood impact.

The most common mistake when writing these rules is setting limits too tight and dropping real players along with the attack. Run each rule in logging mode first, observe for a day how much legitimate traffic it would have caught, and only then switch to dropping.

Layer 3: MTA configuration

A few settings in mtaserver.conf reduce the impact of query-based attacks in particular:

• Manage the query port. If your server does not need to appear in the public list (an invite-only community server, for example), disabling ASE removes the query flood surface entirely. For a public server, apply a strict rate limit on that port at the firewall instead of disabling it.
• Disable LAN broadcast. This cuts unnecessary discovery traffic.
• Keep the maximum player count realistic. A slot count beyond what your hardware can handle causes the server to saturate faster under attack.
• Move file downloads to an external address. Using httpdownloadurl to serve resource files from a separate web server removes your game server's HTTP port from the target list altogether. This is a simple change with a disproportionately large effect.

Layer 4: Scripts and resources

Your own code is an attack surface too. Watch for:

• Validate everything coming from the player; never trust a client-supplied value as-is.
• Add server-side cooldowns to frequently triggered events.
• Do not tie database queries directly to player commands — if every command fires a query, one player can lock your database.
• Remove unused resources from the server entirely.

What to Do During an Attack

Knowing the order of operations in a panic is worth a great deal. When an attack starts:

1. Confirm it first. Is it really an attack, or a script you deployed an hour ago? If your CPU is idle while network traffic is maxed out, an attack is likely. If you struggle to tell the symptoms apart, our guide on DDoS symptoms on a game server offers a quick checklist.
2. Notify your provider. Give the start time, the targeted port, and the traffic volume you observed. That information lets filtering rules be tuned quickly.
3. Collect logs. Capturing a traffic sample while the attack is live is the only way to write durable rules afterwards.
4. Do not keep restarting the server. If the attack is ongoing, restarting only costs you the players who are still connected.
5. Tell your players. A short note on Discord or social media is the cheapest way to stop your community drifting to a rival server.

Common Mistakes

• Relying on the firewall alone. Rules on the machine do nothing once the uplink is full.
• Publishing the server IP everywhere. Use a domain name instead of sharing a raw IP on Discord, forums, or your website.
• Keeping the admin panel on the same IP as the game server. If your web panel sits on a separate machine, you retain management access even while the game server is under attack.
• Running without backups. Attacks rarely arrive alone; they often come alongside intrusion attempts. Without regular backups there is no recovery path.
• Postponing protection. Acting after the first attack does not bring back the players you lost during it.

Frequently Asked Questions

Does Cloudflare protect my MTA:SA server?

No. Cloudflare's free and standard plans are designed for HTTP/HTTPS traffic. MTA:SA gameplay runs over UDP and falls outside that scope. Putting your website behind Cloudflare is useful, but protecting the game server requires infrastructure that filters UDP at the network level.

Can I hide my server's IP address?

Not completely — it has to resolve to an IP for players to connect. However, using a domain name, hosting your website on a separate machine, and moving admin panels to a different IP all make it harder for an attacker to find the right target.

Does shutting the server down during an attack help?

Usually not. The attack targets the IP, not the server process. Shutting down does not stop the traffic; it only costs you the players who would have returned. The correct step is to contact your provider and have filtering adjusted.

Should I get a VDS or a ready-made game server package?

If you would rather not deal with Linux administration, firewall rules, and updates, a ready-made game server package is more practical. If you want to write your own rules, run several servers, or apply custom configuration, a VDS with root access is more flexible. Communities that have grown to very high player counts can also consider a dedicated server.

Can a small server be targeted?

Yes. A significant share of attacks are about grudges rather than scale. A single banned player can make a 20-slot server unplayable for hours. Staying unprotected because your player count is low is not a sound bet.

Does protection increase ping?

With a well-designed filtering setup, players notice no difference. Ping is mainly determined by server location; for a community playing from Turkey, an Istanbul-based server usually delivers better latency than an unprotected overseas one.

Summary

Protecting an MTA:SA server against DDoS attacks is not achieved with a single product, but with stacked layers:

• The network layer scrubs volumetric attacks before you even notice them; UDP coverage is essential.
• The server firewall filters residual traffic and abnormal volume from single sources.
• MTA configuration shrinks secondary targets like the query port and file downloads.
• Script hygiene blocks abuse based on resource exhaustion.
• Preparation — backups, a communication plan, and reachable support — determines how long the attack lasts.

When one of these layers is missing, the others become less effective. The network layer in particular is not something you can solve on your own machine, which makes provider choice a direct factor in your server's uptime.

If you want to move your server onto the right infrastructure: take a look at the MTA server packages delivered from the Istanbul location with DDoS-protected network infrastructure, or the Turkey VDS options if you want full control. If you are unsure which package suits your community, write to our 24/7 support team and we will work it out based on your player count and resource profile.