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If an Arma 3 host is missing from the multiplayer list, first change the browser’s Address setting to LAN on every computer. Arma 3 defaults that browser to Internet, so a listen server on your home network can be invisible until the scope is changed. If discovery still fails, remove filters, confirm the host created a New game, match every branch and mod, then use Remote with the host’s local IP address and configured port. Firewalls, NAT, router behavior and Steam query traffic can also block listings; a dedicated server is the dependable option for persistent or cross-network play.
Why an Arma 3 LAN server can be missing
Arma 3’s multiplayer browser is not a single universal list. Its Address control determines which servers it searches, and the official manual says the browser opens on Internet by default. A listen server hosted on the same home network may therefore be running correctly while the client is looking in the wrong place.
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Fix the browser and host first
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Set the browser Address to LAN
On every player’s PC, open Multiplayer and change the browser’s Address control from Internet to LAN. Refresh the list after changing it. The setting is per browser session, so changing it on the host does not automatically change it for friends.
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A successful result is a server entry appearing under LAN within a refresh. If the host is on Wi-Fi and another player is wired, that is still normally the same LAN, provided both devices are connected to the same private network and the router is not isolating wireless clients.
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Confirm that the host actually started a game
The official FAQ’s creation path is to open Multiplayer, choose New, select the scenario and mission settings, and start the session. Merely opening a lobby or sitting at a setup screen does not create a server that other players can join.
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Refresh without changing several variables at once
Close and reopen the Multiplayer browser, select LAN again, and refresh. Keep the host’s session active during the test. If the entry appears after filters are removed, reapply filters one at a time so you can identify which condition excluded it.
Make every installation compatible
Match the Arma 3 branch
Every player must run the same Arma 3 branch. A stable client cannot reliably join a server running the development branch, and the reverse is also true. On each PC, check the branch selected for Arma 3 in the game’s installation settings, then restart the game after changing it. A branch mismatch can prevent a server from appearing or can allow an entry to appear but fail during connection.
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Match required mods and add-ons
Clients must install the server’s required user-generated add-ons or mods. Compare the host’s active mod list with each client’s list, including versions and load order where the launcher displays them. Disable optional mods for the first test, then add them back in a controlled group after an unmodded or minimal-mod connection succeeds.
A missing or different mod set can produce several symptoms: no visible server, a failed join after selecting the server, or a loading-screen error. Do not treat a successful LAN listing as proof that the mod sets match; discovery and mission loading are separate stages.
Use direct connection when discovery fails
Remote connection on the same network
The in-game manual documents a Remote option for entering a server address manually. On the client, open Multiplayer, choose Remote, enter the host’s local IP address and the configured game port, and connect. Use the host’s private IPv4 address—the address assigned on the home network—not a public address intended for Internet access.
The port must be the one shown by that installation. Arma 3’s host dialog, the host’s RPT log and a dedicated server’s command window display the configured ports. Do not substitute a remembered default if the host has custom settings or a launcher profile that changes them.
What a direct-connect test tells you
- Remote works but LAN is empty: the server is reachable, so focus on browser scope, filters or query traffic rather than the mission itself.
- Remote fails immediately on the same LAN: check the IP address, port, Windows network profile and firewall rules first.
- Remote works locally but not for a friend elsewhere: the remaining issue is normally NAT, router forwarding, an upstream firewall or an Internet-side address/port choice.
Direct connect is also the recommended fallback when browser discovery fails on a dedicated server. It avoids relying on the list while retaining the same compatibility requirements for branches and mods.
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Check Windows firewall and security software
Allow the game and server executables
On Windows, allow arma3.exe and the server executable through the firewall on the network profile that the host is using. A rule created only for a public profile will not necessarily permit traffic when Windows identifies the connection as private, and the reverse can also occur.
When Windows displays a first-run firewall prompt, allowing the program on the appropriate private network is usually the simplest route. If the prompt was dismissed, create or edit the rule in Windows Defender Firewall with Advanced Security and verify that it applies to the executable actually launching the session.
Check third-party security tools
Endpoint security suites can block either game traffic or the server-query packets used to populate a browser. Temporarily test with the security product’s network protection disabled only long enough to identify the cause, then restore protection and add a narrow allow rule for the Arma executables and required ports. Do not leave a firewall disabled as a permanent fix.
Account for routers, subnets and NAT
Same-LAN limitations
Two computers can appear to be in the same house while being placed on different subnets—for example, a guest Wi-Fi network and a private wired network. Client isolation, guest-network isolation and some mesh-router settings deliberately prevent devices from reaching one another. Move both machines to the same non-guest network or disable client isolation for that network, then repeat the LAN and Remote tests.
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For a friend outside the host’s network, the router must send the configured game traffic and Steam server-query traffic to the host PC. The official security guidance says both must be open behind NAT or firewalls. Create forwarding rules for the actual configured ports, not an assumed range, and ensure the rules point to the host’s current private IP address.
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Because a home router can change a device’s private address, reserve the host’s address in the router’s DHCP settings or update the forwarding target whenever it changes. Double NAT—such as a second router behind an Internet gateway—can prevent a single forwarding rule from working; forwarding through both devices or placing one device in bridge mode may be necessary, depending on the network.
Allow ping reporting and executable traversal
The official guidance recommends allowing ICMP echo reply so ping-based status reporting can work. It also recommends NAT traversal for the Arma executables. These settings affect whether a host is visible or reachable; they do not replace forwarding the configured game and query ports when the server is behind NAT.
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Understand Arma 3’s game and query ports
A historical official changelog records that the Steam query port is the game port plus one. Treat that as a relationship, not as permission to assume a universal port number: the authoritative values for a particular installation are the ports shown in the in-game host dialog, the RPT log or the dedicated-server command window.
For example, if an installation reports a game port of P, its query port is historically documented as P + 1. A custom configuration, launcher profile or server wrapper may alter the game port, so read the values from the running installation before creating firewall or router rules. Open both the game and query ports where the server is behind NAT or a firewall.
After changing a port or forwarding rule, restart the server and test in this order: Remote connection from the same LAN, Remote connection from the outside network, then browser discovery. This isolates a routing problem from a query-listing problem.
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Use a dedicated server for persistent or cross-network play
A listen server exists only while the host’s game session is running. Closing the host’s game ends the session, and the host’s machine must also run the game and serve the mission. Bohemia Interactive’s FAQ describes a dedicated server as an option for greater performance, while the dedicated-server documentation covers configuration, branch matching and direct-connect testing.
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When dedicated hosting is the better choice
- Persistent sessions: the server can remain online when the usual host is not playing.
- Cross-network access: one controlled machine handles forwarding, firewall rules and the public endpoint.
- More consistent performance: server CPU, memory and bandwidth are not competing with the host’s rendered game session.
- Repeatable administration: configuration files, logs and startup parameters can be managed independently of a player’s local profile.
Dedicated-server checks
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Install the same Arma 3 branch intended for the clients and install every required server-side mod or add-on.
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Start the server and record the game and query ports printed in the command window or RPT log.
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Allow the server executable through the host firewall on the correct network profile.
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Forward both configured ports through NAT or perimeter firewalls, pointing to the dedicated machine.
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Test with Remote before troubleshooting browser discovery. This confirms that the server itself is reachable and that the clients have the right branch and mods.
Listen hosting, direct connect and dedicated hosting compared
| Method | Reach | Setup effort | Persistence | Firewall and NAT exposure | Performance expectation | Mod requirement |
|---|---|---|---|---|---|---|
| Listen server discovered through LAN | Same LAN | Lowest: choose Multiplayer, New and LAN | Ends when the host exits | Usually limited to the local network, but host firewall rules still matter | Shares the host’s game and server workload | All clients need the host’s required branch and mods |
| Listen server with Remote connection | Same LAN or a reachable cross-network address | Low after the host is running; the client enters IP and port manually | Ends when the host exits | Cross-network play requires configured ports, forwarding and firewall access | Shares the host’s game and server workload | All clients need the host’s required branch and mods |
| Dedicated server | LAN, cross-network or Internet, subject to routing | Highest: separate installation, configuration, firewall and port work | Can remain online independently of a player’s game | Requires deliberate firewall and NAT configuration for game and query traffic | Typically more consistent because the server is separated from a player session | Clients must match the server’s branch and required mods |
Read the symptom before changing settings
| Symptom | Most useful next check |
|---|---|
| The browser is empty, but everyone is on the same home network | Set Address to LAN on every PC, remove filters and refresh. |
| The host sees the server but another player does not | Confirm the other player is also on LAN, not Internet, and check whether the networks are isolated or on different subnets. |
| The server appears, but joining fails while loading | Match the stable/development branch and install the server’s required mods or add-ons. |
| Remote works locally, but an outside friend cannot connect | Verify the public route, forwarding of both configured ports, firewall rules and any double-NAT arrangement. |
| No one can connect, including the host’s LAN client | Check that the host selected New and started the session, then verify the local IP, game port, executable firewall rule and server log. |
| The server is reachable by IP but absent from the list | Focus on query traffic, browser scope and filters; list visibility is not required for a successful Remote connection. |
How many players can an Arma 3 server support?
Bohemia Interactive’s official FAQ describes typical scenarios as catering for 2 to 64 players. That is a scenario-oriented range, not a guarantee for every mission or machine. Practical limits depend on the scenario, server hardware and available bandwidth. A larger player count can therefore require more careful performance testing and may favor a dedicated server over a listen host.
A repeatable troubleshooting checklist
- Set Multiplayer > Address > LAN on every client and refresh.
- Have the host use New and keep the listen session running.
- Remove restrictive browser filters during the first test.
- Match the stable or development branch on every installation.
- Install the server’s required user-generated add-ons or mods on every client.
- Try Remote with the host’s local IP address and configured game port.
- Allow
arma3.exeand the server executable through the Windows firewall on the active network profile. - Check third-party security software, router isolation and subnet placement.
- For cross-network play, forward the configured game and Steam-query ports and account for double NAT.
- Use the ports reported by the host dialog, RPT log or dedicated-server command window; the historical query-port relationship is game port plus one.
- Allow ICMP echo reply for ping reporting and enable recommended NAT traversal for the Arma executables.
- Move to a dedicated server when the group needs persistence, steadier performance or repeatable Internet access.
Bottom line
Most “missing” LAN servers are found by switching the browser from Internet to LAN, starting the host through New, clearing filters and refreshing. If that does not work, Remote connection provides a decisive test: it bypasses discovery and reveals whether the problem is compatibility or networking. Match branches and mods before changing router settings, then work through firewall, subnet, NAT and query-port checks. For a group that plays regularly or across different networks, a dedicated server removes the listen host’s session and performance limitations.
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