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Troubleshooting

Fixes for the common ways Arma 2 OA refuses to cooperate. Work top-down for your symptom. Default Steam path used below: C:\Program Files (x86)\Steam\steamapps\common\Arma 2 Operation Arrowhead\.

Bohemia's own install guide is also worth a read: Arma 2 OA — Windows 10/11 Installation.

Kicked out a few seconds after joining

  1. Did you run base Arma 2 (not OA) at least once? Combined Operations needs it to transfer assets. Confirm: Main menu → Singleplayer → Editor and check Chernarus is in the map list.
  2. If Chernarus is there but you're still kicked: in the Arma 2 OA folder, search for corepatch and delete all .pbo and .bisign files it finds.
  3. In Steam → right-click Arma 2: Operation Arrowhead → Properties → Installed Files → Verify integrity of game files. Let it finish, then try again.
  4. Still failing? Copy the contents of the Arma 2 AddOns folder (excluding the three corepatch_a2* files) into the Arma 2 OA Expansion\Addons folder; choose "Don't overwrite / keep existing" if prompted. Best done on a fresh install.
  5. Some clients are fixed by not installing the BAF/ACR DLC (OA is still required).

Can't connect / no BattlEye GUID message

Reinstall BattlEye:

  1. Close the game.
  2. Go to …\Arma 2 Operation Arrowhead\BattlEye.
  3. Run Uninstall_BattlEye.bat, then Install_BattlEye.bat.
  4. Reboot (may be required), then launch again.

BattlEye master-server outage (game won't launch, reinstall won't help)

Occasionally the A2OA BattlEye master server goes down — this is a recurring, community-wide network issue, not something wrong with your PC or install.

What you see: the game fails to launch through BattlEye. You may see a "failed to launch game" error, a dialog saying Windows cannot access the executable, or the launcher silently times out. A BattlEye reinstall, reboot, or antivirus whitelist change will not fix it, because the problem is that BEDaisy (BattlEye's kernel component) can't reach the master server to authorise your session. There is nothing wrong locally.

How to tell it's the master server and not your PC: if other community members report the same problem at the same time, and launching ArmA2OA.exe directly (without BattlEye) works fine, this is almost certainly the cause.

Workaround while the master is down:

  1. Ask in Discord #support to confirm the master server is down and that the server is running in no-BattlEye mode.
  2. Launch Arma 2 OA directly — use "Play Arma 2: Operation Arrowhead" from Steam and select "Play without BattlEye" if prompted, or start via the non-BattlEye shortcut in your OA folder. Make sure you still launch as Combined Operations (with the Arma 2 base content).
  3. Direct-connect to the server as normal.

When the master server comes back online, switch back to the standard BattlEye launch. The AFK kick system requires BattlEye to be active on both the server and client, so it is only disabled during outages.

Note: this is separate from the Windows 11 24H2 BattlEye launch bug. If you are on 24H2 and the master server is also down, fix the 24H2 issue first (see below), then apply the no-BattlEye workaround if the master is still unreachable.

Failed to launch the game (Windows 11 24H2)

The Windows 11 24H2 update broke launching for many people.

  • Best compatibility fix: downgrade Windows 11 24H2 → 23H2 (Go Back feature / ISO), or use Windows 10 if you already know that setup works for you. Note: Windows 10 is past Microsoft's 2025-10-14 end-of-support date, so treat it as a compatibility fallback rather than a long-term security recommendation.
  • BattlEye v2 fix (without downgrading): download the fix archive (pinned in the Discord #failed-to-launch-the-game channel) + install 7-Zip. Close the game → run BattlEye\Uninstall_BattlEye.bat → go up to …\steamapps\common\ → open the archive with 7-Zip and drop the files in, replacing all → go back into BattlEye\ and run Install_BattlEye.bat → launch.

For the full focused flow, see Windows, BattlEye & launch fixes.

Game crashing

Often the same Windows 11 update. Try, roughly in order:

  • Windows "Optimizations for windowed games" → off (Microsoft support article).
  • Launch parameter -winxp.
  • Match your framerate: Documents\Arma 2\ArmA2OA.cfg → set refresh= to your monitor's Hz.
  • Run Steam and Arma 2 as Administrator.
  • Windows compatibility mode (Win 7/8) on ArmA2OA.exe and ArmA2OA_BE.exe; turn fullscreen optimizations off.
  • Ensure .NET and Visual C++ redistributables are current; disable overlays (Steam/Discord/GeForce Experience).
  • Whitelist these in your antivirus:
    • C:\Program Files (x86)\Common Files\BattlEye\BEService.exe
    • C:\Program Files (x86)\Common Files\BattlEye\BEService_arma2oa.exe
    • …\Arma 2 Operation Arrowhead\BattlEye\BEService.exe
    • …\Arma 2 Operation Arrowhead\BattlEye\BEService_x64.exe
    • …\Arma 2 Operation Arrowhead\ArmA2OA.exe
    • …\Arma 2 Operation Arrowhead\ArmA2OA_BE.exe
  • Add -malloc=system to your launch options.
  • If crashes persist, try -malloc=system plus downgrading the Windows update.

Game freezing (not crashing)

  • -malloc=system in your launch options — this is the main fix.
  • Update your NVIDIA drivers.
  • Set Video Memory to Very High (stops the texture/flush issue). If it happens anyway, flush with CTRL + SHIFT + NUMPAD -.

Invisible assets

You launched plain OA instead of Combined Operations. Re-launch as Combined Operations (required for Takistan / mod events).

Modpack: cruise-missile error on startup

A known JSRS modpack message. Start the game from the _runA2CO batch file in your Arma 2 OA folder. For any other error, try starting vanilla Arma 2 first (not OA). If it persists, post the error in #support — it's usually corepatch files that need deleting + a Steam verify.

"Receiving" screen during gameplay

Random "receiving" screens (especially after opening/closing the map) are the VRAM issue — set Video Memory to Very High. See Performance & FPS.

Other in-game issues

Lots of rare, temporary bugs are fixed by simply changing your in-game slot — e.g. can't repair camp, stuck in another player's squad, map markers disappearing, or odd difficulty changes.

If you can't join at all even after changing slots and others have the same problem, it's the every-few-months server bug — ping a Game Admin / RCON Admin / Server Host to reset the game.

To help get a code bug fixed: grab your ArmA2OA.RPT (type %AppData% in the search bar → go one folder back → Local → Arma 2 OA) and send it on Discord, or post a thread in #report-a-bug.

Still stuck after all this? Post in the Discord #support channel with your symptom and what you've already tried.

Where to post it

  • #support — stuck joining, can't launch, unclear install issue.
  • #report-a-bug — reproducible mission bugs. Include a video when possible.
  • #fps_optimization-discussion — hardware, Windows, driver, or FPS tuning questions.
  • #ask-for-advice — gameplay, commanding, and "what should I do here?" questions.
  • #suggestions — balance ideas, feature ideas, and quality-of-life requests.