For a standard PC Conan Exiles dedicated server, forward UDP 7777, UDP 7778, and UDP 27015 to the server computer’s fixed LAN address. Port 7777 carries game traffic, 7778 is the automatically assigned pinger port, and 27015 handles PC server queries used for browser visibility. TCP 25575 is only for RCON administration and is not needed for ordinary players.
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The forwarding rules, host-firewall exceptions, and server configuration must agree. A server that works from the same home network but is invisible or unreachable from the internet usually has a wrong LAN destination, a missing UDP rule, a blocked host firewall, conflicting ports, or an upstream NAT problem.
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These assignments apply to the PC dedicated-server configuration documented by Funcom. The game port and query port can be changed, but the pinger always follows the game port.
| Port | Protocol | Purpose | Where it is configured | Is it required for ordinary players? |
|---|---|---|---|---|
| 7777 | UDP | Main game traffic | Engine.ini, [URL], Port=7777, or the -Port=? startup argument |
Yes |
| 7778 | UDP | Server-browser pinger | Always the game port plus one; it cannot be changed independently | Yes for reliable browser discovery |
| 27015 | UDP | PC server-query traffic used for browser visibility | GameServerQueryPort=27015 under [OnlineSubsystemNull], or -QueryPort=? |
Yes for normal browser listing |
| 7777 | TCP | On-demand mod-file transfer in the PC/Epic Games Store case | Controlled by ModFileDownload.DownloadPortOffset |
Not part of ordinary gameplay traffic |
| 25575 | TCP | RCON remote administration | RconPort=? under [RconPlugin] |
No; only when RCON is enabled |
Funcom’s setup documentation describes the dedicated server as listening by default on UDP 27015 and UDP 7777. The 7778 pinger is derived from the game port, so it is easy to overlook when creating router and firewall rules.
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What each port does
UDP 7777: the game connection
Players’ game sessions use the configured game port. The default is UDP 7777. Set it in Engine.ini in the [URL] section, or supply a -Port=? startup argument. If you choose another value, every device between the internet and the server must forward that replacement instead of 7777.
UDP 7778: the automatic pinger
The pinger is always one number higher than the game port. With the default game port, it is UDP 7778. It cannot be selected independently, so a server moved to game port 7779 automatically uses UDP 7780 for pings. Server browsers use this response to determine whether the server is available.
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The PC server-query port supports browser visibility. The dedicated server uses Funcom’s custom query implementation. Configure it with GameServerQueryPort=27015 under [OnlineSubsystemNull] or with -QueryPort=?. The deprecated [OnlineSubsystemSteam] section should be removed when using the current dedicated-server arrangement.
TCP 25575: optional RCON
RCON gives remote administrative software access when enabled through the [RconPlugin] section. It is not a player-connection port. Do not forward it merely because it appears in a port list; expose it only when you have deliberately configured RCON and can restrict access to trusted networks.
TCP 7777 for mod transfer
Funcom documents TCP 7777 as an on-demand mod-download port for the PC/Epic Games Store case, controlled by ModFileDownload.DownloadPortOffset. This is separate from the normal UDP game path. Whether you need an additional TCP rule depends on that mod-download configuration and the clients you support; it does not replace the required UDP forwarding.
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Before you create forwarding rules
Give the server a stable LAN address
Forwarding points to an internal address such as 192.168.x.x or 10.x.x.x. If the router later gives the computer a different address, the existing rule points at the wrong machine. Use a DHCP reservation in the router or a static address configured on the host, and record that address before proceeding.
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Decide whether the port values come from Engine.ini and the other INI files or from startup arguments. The server’s active arguments and configuration must agree with the router rules. If you change a value at startup, forward the startup value rather than the documented default.
Choose whether RCON is needed
Leave TCP 25575 closed unless remote administration is intentional. If it is enabled, set an RCON password, limit the source networks in the router or firewall where possible, and avoid exposing administrative access broadly.
How to forward Conan Exiles ports
- Reserve the host address. In the router’s LAN or DHCP settings, reserve an address for the computer running
ConanSandboxServer.exe. A static host configuration is an alternative. - Open the router’s port-forwarding page. Create inbound rules whose destination is that reserved LAN address, not another PC, the router itself, or a temporary address.
- Add the three default UDP rules. Forward external UDP 7777 to internal UDP 7777, external UDP 7778 to internal UDP 7778, and external UDP 27015 to internal UDP 27015. If the router asks for a range, use a one-port range for each rule unless you intentionally use a contiguous range.
- Add the matching host-firewall exceptions. Permit inbound UDP 7777, 7778, and 27015 on the server computer. A router rule cannot bypass Windows or Linux firewall policy; Funcom specifically warns that a firewall exception may be necessary for browser visibility.
- Add RCON only if enabled. If the server uses
RconPort=25575, permit and forward TCP 25575 only to the trusted administration sources you require. Players do not need this rule. - Save and apply the router configuration. Some routers restart their forwarding service or require a reboot before the rules become active.
- Start the dedicated server and verify locally. Launch it with
StartServer.batorConanSandboxServer.exe. Use the operating system’s socket or process tools to confirm that the configured ports are listening on the expected interfaces. - Test from outside your home network. Use a friend’s connection, a mobile hotspot, or another genuinely external network. Check the server browser and, where appropriate, use direct connection with the configured game port. Testing from the same LAN can succeed even when internet forwarding is broken.
Installing and starting the dedicated server
Funcom’s setup procedure uses the Steam “Conan Exiles Dedicated Server” tool or SteamCMD with app update 443030. The executable can be started through StartServer.bat or directly with ConanSandboxServer.exe.
Keep the configuration responsibilities separate while troubleshooting:
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Engine.inicontains general networking values such as the game port.Game.inicontains gameplay settings.ServerSettings.inicontains the administrator password and related server settings.
After changing a port, fully stop and restart the server process before testing. A router can be forwarding the new value correctly while the old process is still listening on the previous one.
Changing ports when another service is using them
A port collision occurs when another server or application already owns a required local port. Do not change only one member of the game-port group. Choose a new game port and query port, then let the pinger follow the new game port automatically.
Funcom’s forum guidance gives this replacement set as an example:
| Function | Default | Example replacement | Rule to forward |
|---|---|---|---|
| Game | UDP 7777 | UDP 7779 | UDP 7779 |
| Pinger | UDP 7778 | UDP 7780 | UDP 7780 |
| PC query | UDP 27015 | UDP 27016 | UDP 27016 |
In this example, set Port=7779 or use -Port=7779, set GameServerQueryPort=27016 or use -QueryPort=27016, and forward UDP 7779, 7780, and 27016 to the same fixed LAN address. The pinger is 7779 + 1, not a separately chosen value.
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Running two or more servers on one machine
Each server instance needs its own game port and query port. It also needs the corresponding pinger port, which is one greater than that instance’s game port. The operating system cannot have two processes claim the same local port on the same address.
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For example, one instance can retain 7777/7778/27015 while a second uses 7779/7780/27016. Give each instance distinct startup arguments or configuration files, start them as separate processes, and create forwarding rules for every external port that internet players must reach. If RCON is enabled on both, assign distinct TCP RCON ports as well; one process cannot share TCP 25575 with another.
Keep a written map of instance, game port, pinger port, query port, RCON port, and LAN address. This prevents a rule for the second server from accidentally pointing at the first server’s process or configuration.
Why friends cannot see or join the server
The server works locally but not remotely
This pattern usually means the game itself is running, but traffic is not traversing the network boundary. Recheck that the router forwards to the host’s current reserved address, that the rules use UDP, and that the host firewall allows the same values. Then test from an external network rather than from another device on the same home LAN.
The server is joinable by direct connection but absent from the browser
Browser listing depends on the query and pinger paths in addition to the game path. Confirm UDP 27015 and UDP 7778 (or their configured replacements) are forwarded and permitted by the host firewall. Also verify that no other process is using the query port.
The router rule appears correct, but the process is listening elsewhere
Inspect the running server’s active configuration and startup arguments. A command-line -Port or -QueryPort value takes the place of the default shown in an INI file for that launch. Restart after edits and verify the local listening sockets again.
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The query port is already occupied
Stop the conflicting service or select a different query port. When changing the game port as part of a multi-instance layout, change the query port at the same time and forward the new pinger automatically derived from the game port.
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Players on the same LAN can connect, but nobody on the internet can
Investigate double NAT, carrier-grade NAT (CGNAT), or an upstream firewall. In a double-NAT arrangement, the traffic may have to pass through two routers. CGNAT can prevent unsolicited inbound connections even when the household router’s rule is perfect. The exact remedy depends on the internet provider and network design; the documented Conan Exiles settings cannot supply a universal fix for those conditions.
The server disappears after a reboot
Check whether the host received a different LAN address and whether the dedicated-server process started with the same configuration. A DHCP reservation or static address prevents the forwarding destination from changing, while an automated startup method keeps the process and its arguments consistent.
Firewall and security checklist
- Allow inbound UDP 7777, UDP 7778, and UDP 27015, or the exact replacement values used by the server.
- Allow TCP 7777 only when the documented mod-download configuration requires it for your PC/Epic Games Store clients.
- Allow and forward TCP 25575 only when RCON is enabled.
- Limit RCON to trusted source addresses or networks instead of exposing it to the entire internet.
- Confirm that router rules and host-firewall rules point to the same fixed LAN address.
- Remove stale rules for old ports after a successful migration so they do not direct traffic to the wrong process.
Choosing a hosting arrangement
Whether you host at home or use another environment, evaluate the network rather than the advertised hardware first. The decisive questions are:
- Can you control inbound router and host-firewall rules?
- Can the server receive a stable LAN or virtual-network address?
- Does the environment support custom UDP forwarding, not only web or TCP ports?
- Can RCON be kept private if you need remote administration?
- Is the host behind CGNAT or double NAT that blocks unsolicited inbound traffic?
A setup that cannot provide configurable UDP forwarding may still run a process, but it will not satisfy the normal public-server browser and player-connection requirements without an additional network solution.
Quick verification checklist
- Record the active game, pinger, query, and optional RCON values.
- Confirm the server computer has a reserved or static LAN address.
- Confirm the server process is listening locally on those values.
- Forward UDP game, pinger, and query ports to that address.
- Match the host-firewall rules to the same protocols and values.
- Check that no second server or application owns the query port.
- Test from an external network and check both browser visibility and direct connection.
- If local access works but external access fails, examine double NAT, CGNAT, and upstream filtering.
Bottom line
Forward UDP 7777, 7778, and 27015 to a fixed LAN address for the default PC dedicated-server setup. Change the game and query ports together when there is a collision, let the pinger remain game port plus one, and add TCP 25575 only for deliberately secured RCON access. Matching the server’s actual configuration, router rules, and host firewall—and testing from outside the local network—solves most visibility and connection failures.
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