This guide covers Arma 3 — Bohemia Interactive’s 2013 military sim with its vast modding ecosystem. If you want hosting for Arma Reforger (the newer 2022 title running on Enfusion engine), we have a separate dedicated guide: Best Arma Reforger Server Hosting UK →
Arma 3 is 12 years old and still the benchmark for PC military simulation. Its mod ecosystem — over 100,000 Workshop entries, including community projects that became standalone games — means the game your group plays today might look nothing like vanilla Arma 3. You might be running Antistasi liberation campaigns across Altis with 20 AI squads patrolling, or operating a whitelisted milsim unit with custom mods and headless clients managing complex AI. Both scenarios have very different hosting requirements, and the right choice for each is different. This guide covers providers from our full UK game server hosting panel — ranked for UK London node availability, mod support depth, headless client capability and GBP pricing.
Arma 3’s Real Virtuality engine processes all AI on a single thread — just like Icarus’s UE4. During a large Antistasi or Zeus operation with 80+ AI units active, that single thread becomes the bottleneck. High single-core clock (5GHz+) is more important than core count. Headless clients are the only way to offload AI beyond what the server CPU alone can handle.
A typical milsim unit modpack (CUP, ACE3, TFAR, RHS, ACRE2, various terrain packs) runs 40–80GB or more. Disk space matters for Arma 3 in a way it doesn’t for lighter games. Some managed hosting plans with fixed small allocations become a problem when you add the third terrain pack. Confirm disk allocation and whether it’s expandable before committing.
At 20ms from a London server, you hear a shot and your character responds cleanly. At 90ms from a US server, there’s a visible disconnect between your action and the server’s response — you’re already dead before you see the bullet. In milsim operations where communication and precision matter, latency isn’t just gameplay comfort; it’s the difference between an operation feeling real and feeling broken.
- Top 3 UK picks
- All providers compared — full table
- Game modes & mission types — Antistasi, Altis Life, KOTH, Exile & more
- Headless clients — what they are and when you need one
- Hardware guide — RAM, CPU & disk by setup type
- server.cfg & basic.cfg — key settings explained
- Workshop mods — installation, verifySignatures & mod keys
- Best host by use case
- FAQ
Best Arma 3 server hosting UK
Ranked by UK/London node, CPU for Real Virtuality single-thread AI, mod support depth, headless client capability and GBP value. DatHost does not offer Arma 3 — top 3 is LOW.MS / Host Havoc / GTX Gaming.
LOW.MS
Gold Pick
🇬🇧 London UK
Milsim ready
LOW.MS earns the top UK spot for Arma 3 through the combination of hardware architecture, London node consistency and the admin tooling that Arma 3 communities need over long-term server operation. Full FTP access for server.cfg, basic.cfg and .Arma3Profile editing, file manager for MPMissions .pbo management and mod key handling, and Steam Workshop support for both automatic and manual mod installation. BattlEye and verifySignatures both confirmed — essential for any server that wants to maintain a moderated, cheat-free community.
For milsim units running headless clients, LOW.MS’s configuration flexibility allows the HC setup that the Bohemia Interactive wiki recommends: headless client on the same machine as the server, whitelisted in server.cfg via headlessClients[] and localClient[]. Their FTP access and command-line configuration capability means you can implement the full FASTER workflow — the modern successor to TADST — for Workshop mod management and server profile configuration without support tickets.
Corero inline DDoS protection matters for Arma 3 specifically — public servers attract attention, and a DDoS during an operation is more disruptive in Arma 3 than in most games because mid-operation reconnections mean AI respawn calculations restart, breaking scenario state. The 5-day refund is generous enough to test a full Antistasi mission cycle and verify AI performance under representative load.
- ✓ Ryzen 9 9950X — high single-core for AI-heavy missions
- ✓ London UK — sub-20ms for UK milsim communities
- ✓ Full FTP + server.cfg/basic.cfg edit access
- ✓ BattlEye + verifySignatures confirmed
- ✓ Headless client support + Workshop mods
- ✓ 5-day refund · 4.8★ Trustpilot · Corero DDoS
- ✗ No one-click Antistasi/Altis Life installer (unlike Host Havoc)
- ✗ Fewer global locations than BisectHosting
Host Havoc
Silver Pick
🇬🇧 London
Host Havoc’s custom-designed Arma 3 game template in TCAdmin is built around the specific parameters Arma 3 server operators actually use — command-line configuration for mod loading (-mod= and -servermod= flags), Steam Workshop mod installer integration, profile management for multiple difficulty presets, and wide-ranging Arma 3-specific launch parameters that go beyond what generic game panels expose. Their documentation for Arma 3 specifically covers headless client setup, BattlEye configuration, verifySignatures, mod key management and the most common mission-specific configuration requirements.
Own physical hardware means no CPU throttling during the spike moments that define Arma 3 performance — specifically the frame drop that hits when a large Zeus composition spawns, or when Antistasi’s dynamic AI repositioning triggers across multiple zones simultaneously. Sub-10-minute support response and 4.8★ from 1,515 reviews. Entry at $20/mo for 40 slots (£14.82/mo) makes Host Havoc premium-priced but justified for communities running complex modded scenarios.
- ✓ Altis Life 4.4 + 5, Antistasi, Exile, CUP — one-click
- ✓ Own hardware — no throttle on AI spike events
- ✓ London UK · custom Arma 3 TCAdmin template
- ✓ Full command-line config · Workshop installer
- ✓ 4.8★ from 1,515 reviews · <10 min response
- ✗ Higher entry price ($20/mo 40 slots)
- ✗ 72h refund window
GTX Gaming
Bronze Pick
🇬🇧 London + Stockholm
Best budget UK
GTX Gaming is the most established managed provider for Arma 3 specifically — they’ve been running Arma servers since the Arma 2 era and their panel has Arma 3-specific features that reflect years of community feedback. Their Workshop mod installer handles the most common challenge for Arma 3 server admins: getting Workshop mods onto the server without manual SteamCMD operations. Scheduled messages (for MOTD rotation — important on public servers), scheduled restarts (for the Arma 3 memory leak that affects long-running servers) and game switching are all native panel features.
Their standard UK location uses Ryzen 9 5950X hardware; upgrading to the “extreme” tier gets you Ryzen 9 7950X CPUs — still strong single-core performance for AI-heavy operations. At £9.27/mo for a 10-slot entry server, they’re competitive for smaller communities and clan servers. The 7-day refund is the most generous in our top 3, giving time to properly evaluate AI performance during a representative operation before committing.
- ✓ Established Arma 3 provider — Arma 2 era track record
- ✓ Workshop installer · scheduled messages + restarts
- ✓ London + Stockholm · Ryzen 9 7950X extreme tier
- ✓ 7-day refund · 4.7★ (1,386 reviews)
- ✓ Competitive £9.27/mo entry pricing
- ✗ Standard tier uses older Ryzen 9 5950X (upgrade for 7950X)
- ✗ No one-click Altis Life / Antistasi like Host Havoc
All Arma 3 hosting providers compared
GBP ($1=£0.741, ). ✅ UK = confirmed London node. HC = headless client support confirmed. ⚠ = verify directly. DatHost does not offer Arma 3.
| # | Provider | GBP/mo | 🇬🇧 UK? | HC | Workshop | Trustpilot | Notes | |
|---|---|---|---|---|---|---|---|---|
| 1 | LOW.MS | £8.12 | ✅ London | ✅ | ✅ | 4.8★ (193) | Ryzen 9 9950X · BattlEye · 5-day refund | Visit → |
| 2 | Host Havoc | from £14.82 | ✅ London | ✅ | ✅ | 4.8★ (1,515) | Own HW · Altis Life + Antistasi one-click · <10 min | Visit → |
| 3 | GTX Gaming | from £9.27 | ✅ London + Stockholm | ✅ | ✅ | 4.7★ (1,386) | Workshop installer · Ryzen 9 7950X extreme · 7-day | Visit → |
| 4 |  BisectHosting | ~£8.89–13 | ✅ London | ✅ | ✅ | 4.8★ (25,348) | 21 locations · NVMe · 15 min support · 3-day backup | Visit → |
| 5 |  Apex Hosting | ~£11+ | ✅ London | ✅ | ✅ | 4.8★ (8,054) | One-click modpacks · beginner-friendly · 7-day | Visit → |
| 6 |  Gaming Deluxe | ~£10 | ✅ London · GBP | ✅ | ✅ | 4.5★ (82) | UK company · GBP billing · DDR5 5.0GHz+ | Visit → |
| 7 |  GGServers | ~£4.45 | ✅ London | ⚠ | ✅ | 4.6★ (3,407) | Budget UK · London · NVMe · verify HC | Visit → |
| 8 |  Shockbyte | ~£7.41+ | ✅ EU | ✅ | ✅ | 3.8★ (10,176) | Budget EU entry · unlimited slots · 72h | Visit → |
| 9 |  Nitrado | ~£5–12 | ✅ EU | ✅ | ✅ | 3.6★ (7,403) | Pay-as-go · EU nodes · share access | Visit → |
| 10 |  G-Portal | ~£7/mo equiv. | ✅ Frankfurt | ⚠ | ✅ | 4.0★ (2,836) | Pay-as-go · Frankfurt DE · verify HC | Visit → |
| 11 |  Survival Servers | ~£7.41+ | ✅ EU | ✅ | ✅ | 4.7★ (862) | Epoch · Exile · Antistasi one-click · NVMe | Visit → |
| 12 |  ScalaCube | ~£5.93 | ✅ UK + EU | ⚠ | ✅ | 4.5★ (4,713) | UK node · one-click setup · custom launcher | Visit → |
| 13 |  SparkedHost | from £5.93 | ✅ EU + UK | ⚠ | ✅ | 4.8★ (2,291) | Ryzen 9 DDR5 · Apollo panel · 48h refund | Visit → |
| 14 |  Wabbanode | ~£8.89 | ⚠ Verify | ✅ HC guide | ✅ | 4.7★ (42) | HC config guide published · Ryzen 9 7950X DDR5 | Visit → |
| 15 |  Indifferent Broccoli | ~£12.59 | ⚠ Germany EU | ✅ | ✅ | 4.4★ (792) | Uncapped RAM · 7-day refund · EU only | Visit → |
| 16 |  AleForge | £5.93 (8GB) | ⚠ US only | ⚠ | ✅ | 4.9★ (139) | Cheapest/GB · US only · Ryzen 9 · 7-day | Visit → |
| 17 |  Hostinger | £7.03 | ✅ UK VPS | ✅ manual | ✅ | 4.7★ (66k+) | VPS · 8GB AMD EPYC · game panel · $5.99/mo entry | Visit → |
DatHost does not offer Arma 3. HC = headless client support. ⚠ = verify directly. Prices GBP, . All servers require SteamCMD App ID 233780. Ports: UDP 2302 (game), 2303 (query), 2305 (Steam).
Arma 3 game modes — and what each demands from your server
Arma 3 is a sandbox — the game your group plays depends almost entirely on which missions and mods you run. Each game mode has different server requirements, different hardware profiles and different hosting considerations. Understanding what you’re actually running helps you choose the right plan.
Persistent liberation campaign where players progressively capture territory from AI-controlled forces. Dozens of AI patrols, garrison management, dynamic reinforcement calls and persistent world state make Antistasi the most CPU-intensive common Arma 3 game mode. A headless client is near-mandatory for smooth Antistasi performance with more than 8 players. Server saves persist across restarts — backups are critical.
Police/civilian roleplay on Altis. Relatively few AI (mostly police NPCs and occasional scripted events), but runs a full MySQL database for persistent player data, money, vehicles, property and inventory. MySQL access is a hard requirement. A well-configured Altis Life server is more database I/O bound than AI-CPU bound. Host Havoc provides Altis Life 4.4 and 5 one-click installers. Version 5 adds significant features over 4.4 but requires more configuration.
Three-team competitive PvP with zone capture on a fixed area. AI elements present but player interaction dominates CPU load. KOTH servers often run 80+ concurrent players — much higher than Antistasi or Altis Life. Network bandwidth and slot count are the primary considerations over AI CPU. Popular on public servers. DDoS protection is especially important for public KOTH servers which attract competitive communities.
Open-world survival with base building, looting and PvP. Both require MySQL for player data and vehicle persistence. Moderate AI (wandering infected/zombies in Epoch, bandit AI in Exile). Custom loot tables and dynamic events add to simulation load. Survival Servers specifically lists both Exile and Epoch as one-click installers. Host Havoc also includes Exile one-click.
Zeus (also called Game Master) allows one or more players to create and control the scenario in real time — spawning units, vehicles, triggers and compositions while others play. CPU load is highly variable: when a Zeus spawns a large armoured formation, AI load spikes immediately. The zeusCompositionScriptLevel = 2 parameter enables Zeus to spawn compositions from Workshop. Headless clients help absorb Zeus spawn spikes.
Military simulation units run custom-made missions with full modpacks (ACE3, TFAR, RHS). Mission complexity and player count drive performance requirements. A well-scripted milsim mission with 20 players and 60 AI using a headless client will perform better than a poorly scripted mission with 10 players. BattlEye and verifySignatures are standard for milsim servers. Modpacks can exceed 50GB — disk space is a real consideration.
Headless clients — what they are and when your Arma 3 server needs one
The headless client is Arma 3’s solution to its single-threaded AI limitation. Understanding when you need one — and how to configure it correctly — is one of the most valuable pieces of technical knowledge for any Arma 3 server operator.
A Headless Client is Arma 3 running without any graphics or audio output, connected to your server, and dedicated entirely to processing AI calculations. Because Arma 3’s Real Virtuality engine handles all AI on one thread, a busy mission can push that thread to 100% while other cores sit idle. An HC takes over AI processing from the main server process, freeing the server to handle communication with players instead. The result is higher stable FPS on AI-heavy missions — noticeably improved in Antistasi with many active fronts, or in Zeus during a large unit spawn.
You need a headless client when: your server FPS drops below 10 during normal gameplay (check with #monitor in-game admin), when running Antistasi or other persistent campaigns with 30+ concurrent AI, or when Zeus operations frequently involve large unit compositions. You do NOT need an HC for small friend group missions, vanilla Arma combat, KOTH (player-heavy, low AI), or any mission where AI counts are modest. Headless clients only help if your mission is actually scripted to distribute AI to them — not all missions support HC by default.
RAM, CPU & disk — Arma 3 server hardware by setup type
| Setup type | Players | RAM | Disk | HC needed? |
|---|---|---|---|---|
| Vanilla / small missions | 4–16 | 4–6GB | 30GB | No |
| Altis Life / KOTH | 20–60 | 6–8GB | 40GB | Optional |
| Antistasi / Zeus (moderate) | 10–20 | 8–12GB | 50GB+ | Strongly recommended |
| Milsim unit (full modpack) | 20–40 | 12–16GB | 80–120GB | Yes for heavy ops |
| Public KOTH (high slots) | 40–80 | 12–16GB | 50GB | Optional |
A typical milsim modpack (ACE3, TFAR, RHS combined, CUP Terrains, additional DLC-equivalent mods) reaches 50–100GB. Many managed hosting plans have small default disk allocations — check whether disk space is expandable before ordering. Ask specifically about the modpack you intend to run.
Arma 3 has a known memory leak — server RAM usage grows over time during long sessions. Schedule automated restarts every 12–24 hours during off-peak hours. GTX Gaming’s scheduled restart feature handles this natively. On other hosts, set up a Scheduled Task in the control panel. Without restarts, a 24-hour Antistasi session will eventually run out of memory and crash.
Like all Real Virtuality games, Arma 3’s AI thread benefits from the highest possible single-core clock speed. Ryzen 9 9950X (LOW.MS) and Ryzen 9 7950X (GTX Gaming extreme) are the best available in managed hosting. Avoid EPYC-only providers for Arma 3 AI-heavy missions — EPYC trades single-core speed for many cores.
Server ports
server.cfg & basic.cfg — the key settings for a UK Arma 3 server
Arma 3 uses two main config files: server.cfg for server rules, security and player limits, and basic.cfg for network performance tuning. Both are plain text files editable via FTP or your host’s file manager.
server.cfg — essential settings
Setting verifySignatures = 2 means players running unsigned or unknown mods cannot join. For milsim and modded servers, this is security against players joining with mismatched mods that can desync the simulation or introduce cheats. Every mod you use needs its .bikey file copied to your server’s keys/ directory. Without the key, players with that mod can’t join when verification is set to 2.
Set to 1 to allow headless clients to connect while blocking regular clients with filePatching enabled (which can be a cheat vector). Value 0 blocks everything, 2 allows everyone. For most community servers, 1 is the right balance — HCs work, file patching cheats are blocked.
This undocumented parameter is critical for large modpacks. When you have many Workshop mods active, they “all break” simultaneously — players can’t join. This is caused by the Steam protocol packet size limit. Adding steamProtocolMaxDataSize = 1048576; to your server.cfg fixes it. Not documented officially, but widely used by large milsim communities.
basic.cfg — network performance tuning
basic.cfg controls how Arma 3 uses network bandwidth. On a UK London server with decent connection, the values above work for most scenarios. For KOTH servers with 60+ players, increase MaxBandwidth accordingly. MaxCustomFileSize = 0 prevents players from uploading custom face images which reduces bandwidth and a minor security risk.
Steam Workshop mods — installation, mod keys and verifySignatures
Unlike Icarus (.pak files, no Workshop), Arma 3 has full Steam Workshop integration. Workshop mods are available on managed hosting servers, though the exact process differs between “Workshop installer” panels and FTP-based manual management.
GTX Gaming, BisectHosting, Apex Hosting and others offer a Workshop mod installer directly in the control panel. You search for mods by Workshop ID or name, select them, and the panel handles downloading and placing them in the correct @ModName folder structure. The panel also manages adding mods to the launch command line and, in some cases, handles mod key installation.
FASTER (the modern TADST replacement) downloads Workshop mods to a staging directory, deploys them to your server folder structure, handles the -mod= launch parameter generation and distinguishes between server-required (deploy on server), client-required (players must have it) and headless-client mods. Full control for advanced operators. Requires FTP access to the server for deployment.
Mod keys — the step everyone forgets
Most popular Arma 3 mods for community servers
Advanced Combat Environment — medical system, ballistics, interactions. Near-universal in milsim. Server and client required.
Radio communication mods — integrate with TeamSpeak or Discord. TFAR is simpler, ACRE2 more realistic. Both require all players to have them.
Red Hammer Studios — adds high-quality USAF, AFRF and GREF factions with realistic weapons and vehicles. Four separate .pbo collections.
Community Upgrade Project — backports from Arma 2 into Arma 3. Huge additional content, maps, factions. Required for many popular missions.
The mission mod itself. Download via Workshop and place the .pbo in MPMissions. Requires its own configuration and HC support for best performance.
Not a mod — an undocumented server.cfg parameter. Add it when you have many mods and they “all break” — players can’t join. Add to server.cfg: steamProtocolMaxDataSize=1048576;
Best UK Arma 3 host for your community type
Ryzen 9 9950X · London UK · BattlEye + verifySignatures · HC support · full FTP + config access · 5-day refund · from £8.12/mo. Best single-core performance for AI-heavy missions.
Altis Life 4.4 + 5 one-click · Antistasi one-click · Exile · CUP · own hardware · London UK · <10 min support. Best if you want a specific popular game mode up and running without manual configuration.
From £9.27/mo · Workshop installer · London + Stockholm · Ryzen 9 7950X extreme tier · 7-day refund. Established Arma 3 provider with the longest track record of our top 3.
Both offer BattlEye, verifySignatures, HC support and full config file access. LOW.MS for maximum CPU headroom; Host Havoc for own-hardware AI spike resilience. Both London UK.
One-click modpacks · London · beginner-friendly panel · 7-day refund · 4.8★ from 8,054 reviews. Best for first-time Arma 3 server owners who want a guided setup experience.
UK-based · London · GBP billing · DDR5 5.0GHz+ · ~£10/mo. Best for UK milsim units or communities wanting GBP invoicing and a British company to deal with.
Epoch and Exile one-click · EU nodes · full database access · NVMe SSD · 4.7★ (862 reviews). Survival Servers specialise in exactly the game modes their name implies — Exile, Epoch and similar Arma 3 survival sandboxes.
Arma 3 and Arma Reforger are different games running on different engines — Arma 3 uses Real Virtuality, Reforger uses the newer Enfusion engine. If your group is considering making the move to Reforger (or running both), our dedicated UK guide covers every provider for that game too: Best Arma Reforger Server Hosting UK →
Arma 3 server hosting UK — FAQ
#monitor as admin), you’re running Antistasi with many active fronts, or Zeus operations frequently involve large unit spawns. You don’t need an HC for vanilla missions, KOTH, or small group operations. The HC must run on the same machine or same LAN as the server — not on a separate remote machine.keys/ folder. Most managed hosts handle this through their Workshop installer. Without the key in keys/, players with that mod will fail signature verification when verifySignatures = 2.steamProtocolMaxDataSize = 1048576; to your server.cfg. This is an undocumented parameter not mentioned in Bohemia Interactive’s official wiki, but it’s widely used by large milsim communities and has been confirmed to resolve the issue. If your mods all worked fine until you added the 15th or 20th mod, this is almost certainly the cause.-mod= parameter lists mods that both the server and all connecting clients must have. Players who don’t have these mods will be unable to join. The -servermod= parameter lists mods that only run on the server side — players don’t need them installed locally. Common servermod examples include TaskForce Radio server components and some admin tool mods. Using -servermod= for server-only components reduces the modpack size players need to download, which improves accessibility for new players joining your community.-mod= launch parameter string, creating server profiles with different difficulty settings, and distinguishing between server-required, client-required and headless-client mods. For milsim unit admins managing large modpacks across multiple server profiles, FASTER significantly reduces the manual work involved in keeping mods updated and launch parameters correct. Most managed hosting providers expose the necessary command-line parameters through their panel; FASTER generates the strings you paste in.