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BeamMP’s default server port is 30814. Set or confirm Port = 30814 in ServerConfig.toml, forward that port from your router to the computer running BeamMP-Server for both TCP and UDP, and allow the server through the host firewall for incoming and outgoing traffic. If you choose another port, replace 30814 everywhere with that value. You can verify reachability with CheckBeamMP while the server is running.
What port does BeamMP use?
A standard BeamMP server listens on port 30814. BeamMP requires the port over both the TCP and UDP protocols; forwarding only one protocol can leave the server unreachable or cause inconsistent connection results.
The setting is stored in ServerConfig.toml, in the [General] section:
[General]
Port = 30814BeamMP’s official port-forwarding guidance describes the requirement as both UDP and TCP port 30814 unless you have changed the value in ServerConfig.toml. The number is not a web address or a separate game-server identifier: it is the network port on which the BeamMP process accepts connections.
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BeamMP port requirements and limits
- Default: 30814.
- Protocols: TCP and UDP.
- Valid custom values: 1024 through 65535.
- Availability: the selected port must not already be used by another service on the host.
- Multiple servers: each BeamMP server on the same computer needs its own port.
In server release v3.2.0 and later, environment variables can override values in the configuration file. For the port, that can include BEAMMP_PORT. If the file says 30814 but the running process behaves as though another port is configured, inspect the environment used to launch the service, scheduled task, container, or hosting panel before changing router rules.
What you need before creating a forwarding rule
A stable local IPv4 address
Your router forwards traffic to a device address on the local network. Assign the hosting computer a stable local IPv4 address, preferably with a DHCP reservation in the router or a correctly configured static address. If the address changes after a reboot, the existing rule may point to the wrong computer.
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A reachable public address
Internet players connect to your public IP address and the configured port. Home hosting therefore requires an ISP connection that provides a reachable public IPv4 address and a router you can configure. BeamMP warns that carrier-grade NAT (CGNAT) and many mobile 4G/5G connections can prevent residential port forwarding: the router may show an address, but inbound traffic cannot reach it because another provider-controlled NAT sits upstream.
Router and host-firewall access
You need administrator access to the router and to the operating-system firewall on the server computer. Port forwarding changes the router; a firewall exception changes the host. Both are required. Forwarding a port while the host firewall silently drops it produces the same symptom as a missing router rule.
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How to port forward BeamMP step by step
1. Generate and inspect the server configuration
- Start BeamMP-Server once. The first run creates
ServerConfig.tomlif it does not already exist. - Stop the server cleanly and open the file in a text editor.
- Under
[General], confirmPort = 30814, or note the custom value you intend to use. - If the file and observed behavior disagree, check for an environment override such as
BEAMMP_PORT, particularly on v3.2.0 and later.
Do not use a port that another application already occupies. If you run more than one BeamMP instance on the same machine, assign a different unused value to every instance.
2. Reserve the host’s local address
Find the hosting computer’s local IPv4 address and create a router DHCP reservation for it. The exact menu name varies, but it is commonly under LAN, DHCP, connected devices, or address reservation. Record the address; the forwarding rule must target it, not the router’s own address.
3. Create the router rule
- Open the router’s administration page and find Port Forwarding, NAT, Virtual Server, or a similarly named menu.
- Create a rule targeting the hosting computer’s reserved local IPv4 address.
- Set the external (public) port and internal (private) port to the configured BeamMP value. If the router has separate fields, use the same number in both.
- Select TCP and UDP in one combined rule, or create two rules with identical port numbers, one for TCP and one for UDP.
- Save or apply the configuration. Some routers require a reboot; others activate the rule immediately.
For the default setup, the resulting rule forwards external TCP 30814 and UDP 30814 to internal TCP 30814 and UDP 30814 on the BeamMP host. A custom port follows exactly the same pattern with its replacement number.
4. Allow the server through the host firewall
In the operating-system firewall, allow BeamMP-Server itself, or create rules for the configured port. Permit both TCP and UDP, and allow incoming and outgoing traffic. If the firewall asks whether the rule applies to private or public networks, choose the profiles that match the network on which the server actually runs, while keeping the rule limited to the required BeamMP port rather than disabling the firewall globally.
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5. Start the server and test externally
- Start BeamMP-Server with the final configuration.
- Leave it running while testing; a closed application cannot answer a port check.
- Use CheckBeamMP to test the public address and configured port.
- Ask a player outside your home network to connect using the public IP address and port, or test from a separate internet connection.
A test from inside the same network may not accurately represent internet reachability because routers handle loopback (hairpin) connections differently. Use the address appropriate to the test location.
Which address should each player use?
| Player location | Address format | Purpose |
|---|---|---|
| The same computer running BeamMP-Server | 127.0.0.1:30814 (or your custom port) |
Local loopback test that never leaves the host. |
| Another device on the same home network | host-LAN-IP:30814 |
Uses the server computer’s local IPv4 address. |
| A player on the internet | public-IP:30814 |
Uses the router’s reachable public address and the forwarded port. |
If you have changed the port, substitute that value in every address. A server configured as Private = true does not appear in the public server list, but players can still join directly when they have the correct address and the port is reachable.
Why friends cannot connect: a diagnostic order
The server is listening on a different port
Reopen ServerConfig.toml and verify the value under [General]. Then check launch parameters and environment variables, including BEAMMP_PORT on v3.2.0 or newer. The router, firewall, CheckBeamMP test, and player connection must all use the effective runtime port, not an outdated file value.
Only one protocol was forwarded
Inspect the router rule and confirm that both TCP and UDP are enabled. Also verify that the host firewall allows both protocols in both directions. A TCP-only rule is not a complete BeamMP configuration.
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The forwarding target changed
Compare the router rule’s destination with the hosting computer’s current local IPv4 address. If DHCP assigned a new address, restore the reservation or update the rule, then test again.
The port is already occupied
A custom port must be unused on the host. Stop the conflicting service or select another value between 1024 and 65535, then update the configuration, router, firewall, and connection address together. Do not assign the same port to two BeamMP servers on one machine.
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Start BeamMP-Server before testing. Confirm that the operating-system firewall has an exception for the server or its configured TCP and UDP port. Keep the firewall enabled; turning it off can hide the real rule error and unnecessarily expose other services.
The ISP uses CGNAT or a mobile connection
CGNAT and many 4G/5G services can make inbound residential forwarding impossible even when the router interface accepts a rule. In that situation, changing the BeamMP port or repeating the same rule will not create a reachable public endpoint. Use a network with a reachable public IPv4 address or host the server on a VPS/root server, where the residential-router step is avoided.
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The server is private rather than publicly listed
Private = true controls listing, not the underlying direct-connection port. Give players the public IP and configured port and ensure the forwarding and firewall checks pass.
Home hosting versus a VPS or root server
Neither approach changes BeamMP’s requirement for a configured TCP and UDP port. The practical decision is whether your home connection can accept inbound traffic and whether you want to operate the network edge yourself.
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| Decision factor | Home hosting | VPS/root-server hosting |
|---|---|---|
| Reachable public IPv4 | Depends on the ISP; CGNAT or mobile service may prevent forwarding. | Typically provides a directly managed internet interface; the provider’s exact networking terms still apply. |
| Router work | Required: forward the port to the local host. | Residential router forwarding is skipped. |
| Host firewall | Must allow BeamMP traffic on the home computer. | Must allow the port in the server’s firewall and any provider-level firewall. |
| Monthly cost | Not stated; depends on your existing connection and electricity. | Not stated; depends on provider, region, and server size. |
| Geographic latency | Often favorable for players near your home connection. | Depends on the selected data-center region and each player’s route. |
| Administration | You manage the router, local address, computer, and firewall. | You manage the server and firewall but not a residential NAT rule. |
| Multiple BeamMP servers | Each instance needs a distinct host port and corresponding forwarding rules. | Each instance still needs a distinct port; provider networking does not remove that requirement. |
Security practices for an exposed BeamMP port
BeamMP identifies port forwarding as a security risk and does not take responsibility for externally linked services. Expose only the configured BeamMP port, keep the host firewall enabled, and avoid broad “allow all traffic” rules. Apply operating-system updates, run only the services you need on the host, and review forwarding entries you no longer use. If you stop hosting, remove the router rules and firewall exceptions.
Changing the port is useful for avoiding a local conflict, but it is not a substitute for firewalling or a security boundary. The effective value must remain consistent in the server configuration, environment, router, firewall, CheckBeamMP test, and player instructions.
Quick Recap
Quick verification checklist
ServerConfig.tomlcontains the intended[General]Portvalue.- No
BEAMMP_PORTor other launch setting overrides that value unexpectedly. - The value is between 1024 and 65535 and is unused by another host service.
- The host has a stable local IPv4 address.
- The router forwards the same external and internal port to that address.
- Both TCP and UDP are selected.
- The host firewall allows BeamMP traffic in both directions.
- BeamMP-Server is running during the test.
- CheckBeamMP reports the public endpoint as reachable.
- Players use loopback, LAN, or public addressing appropriate to their location.
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