What’s actually slowing this PC down?
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BeamMP uses port 30814 by default. In ServerConfig.toml, confirm [General] contains Port = 30814, then forward that same number to the computer running BeamMP-Server for both TCP and UDP. Allow the server through the host firewall in both directions. If you choose another port, substitute it consistently in the configuration, router, firewall and connection address.
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What port does BeamMP use?
The default BeamMP server port is 30814. BeamMP’s official port-forwarding guidance states that the server requires both UDP and TCP on port 30814 unless you changed the value in ServerConfig.toml. The port is not merely a router setting: BeamMP-Server must be listening on the same number, the router must send that number to the correct host, and the operating-system firewall must permit the traffic.
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The number applies to the server’s network endpoint, not to the game client generally. Players outside your network connect to your public IP address and the configured port. A client on the same computer can use 127.0.0.1:<port>; another device in the house should use the server computer’s LAN IPv4 address and port.
Where to check or change the BeamMP port
Let BeamMP create the configuration file
- Run BeamMP-Server once. On its first run, it creates
ServerConfig.toml. - Stop the server before editing the file so that a running process does not overwrite your change.
- Open
ServerConfig.tomlin a plain-text editor and locate the[General]section. - Read the
Portentry. A default installation should showPort = 30814.
Choose a custom port safely
The maintenance configuration reference permits values from 1024 through 65535. Pick a number in that range that is not already used by another service on the host. If several BeamMP servers run on one machine, each server needs its own port; two processes cannot share the same address and port combination.
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After changing the value, save the file and use the new number everywhere: router forwarding, firewall rules, CheckBeamMP testing and the address given to players. Leaving one component on 30814 while changing another component creates a connection failure that can look like a firewall problem.
Check for an environment-variable override
BeamMP server release v3.2.0 and later supports environment variables that can override values in ServerConfig.toml, including BEAMMP_PORT. If the file says one port but the running process appears to listen on another, inspect the environment used to launch the service, scheduled task, container or hosting panel. Remove or correct the override, then restart BeamMP-Server and test again.
How to forward BeamMP port 30814
1. Give the server computer a stable LAN address
Router forwarding rules target a private address such as 192.168.x.x or 10.x.x.x. If the router later gives the host a different address, the rule points to the wrong device. Reserve the host’s IPv4 address in the router’s DHCP settings, or configure a stable local address using the method appropriate for your operating system and network.
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2. Create the router rule
- Sign in to the home router’s administration interface.
- Open the section named Port Forwarding, Virtual Server, NAT or a similar label.
- Create a rule that sends external port
30814to the BeamMP host’s stable LAN IPv4 address on internal port30814. - Select TCP and UDP. If the router cannot combine protocols, create one TCP rule and one UDP rule with the same destination.
- If the interface asks for separate external and internal ports, enter 30814 in both fields.
- Save or apply the rule. Some routers require a reboot; follow the interface’s instruction if it requests one.
For a custom port, replace 30814 in every field. Do not forward a broad range when one port is sufficient.
3. Permit the server through the host firewall
On the computer running BeamMP-Server, allow the BeamMP-Server application, or allow the configured port, for incoming and outgoing TCP and UDP. The router can deliver a packet correctly while the host firewall silently discards it, so both layers matter. Keep the firewall enabled and create the narrowest rule that permits the selected BeamMP port rather than disabling protection globally.
4. Start BeamMP-Server before testing
Port tests report failure when no process is listening. Start the server with the intended configuration, verify that it remains running without a bind error, and only then test the endpoint.
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Which address should each player use?
| Player location | Address format | Which address to enter |
|---|---|---|
| Same computer as BeamMP-Server | 127.0.0.1:<port> |
Use the loopback address and the configured port, for example 127.0.0.1:30814. |
| Another device on the same home network | <LAN IPv4>:<port> |
Use the server computer’s private LAN address, not the router’s public address. |
| Player outside the home network | <public IP>:<port> |
Use the home connection’s reachable public IPv4 address and the forwarded port. |
A server configured with Private = true will not appear in the public BeamMP server list. That setting does not prevent direct connections when the address, port and forwarding path are reachable; give invited players the correct endpoint instead.
How to test the port with CheckBeamMP
- Confirm the configured port in
ServerConfig.toml, including any environment-variable override. - Start BeamMP-Server and leave it running.
- Run CheckBeamMP against the public address and configured port.
- Interpret a successful result as evidence that the external path can reach the listener at that moment; it does not replace checking the game configuration or server availability.
- If the test fails, work through the troubleshooting branches below instead of changing several settings at once.
For a same-machine check, connect to 127.0.0.1. For an in-home check, use the host’s LAN address. External testing must use the public address; a local address cannot be routed from the wider internet.
Why friends cannot connect
The configuration and forwarding ports differ
Compare the Port value in ServerConfig.toml with the router’s external and internal ports, firewall rules and the number players typed. If any one differs, make them consistent. On v3.2.0 or newer, also check BEAMMP_PORT and other launch-time environment settings.
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Only one protocol was forwarded
BeamMP requires both TCP and UDP. A TCP-only rule, or a UDP-only rule, is incomplete even if a generic port checker reports partial success. Use a combined TCP/UDP rule or two separate rules.
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The rule targets the wrong computer
Check the host’s current LAN IPv4 address and compare it with the router rule. DHCP changes can invalidate an otherwise correct rule; reserve the address or update the destination.
The host firewall blocks the listener
Allow BeamMP-Server or the selected port for both protocols and both incoming and outgoing traffic. Confirm that another security product has not added a second blocking layer. Do not solve the problem by turning the firewall off permanently.
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No service is listening
Start BeamMP-Server before running CheckBeamMP. A server that exits immediately may have a configuration error, a port conflict or an environment override. A custom port must be unused by every other service on the host.
The internet connection uses CGNAT
Some residential providers place customers behind carrier-grade NAT (CGNAT), so the router does not receive a directly reachable public IPv4 address. In that arrangement, an ordinary inbound forwarding rule cannot create an internet-reachable BeamMP server. Mobile 4G and 5G connections can have the same limitation. Ask the provider whether a reachable public IPv4 option is available, or host the server on a VPS or root server instead.
The public address is not stable
A changing public IPv4 address can make an old connection address stop working even when forwarding remains correct. Confirm the current public address before sharing it. The forwarding rule itself still targets the private LAN address; the public address is what outside players use.
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| Decision factor | Home computer | VPS or root server |
|---|---|---|
| Reachable public IPv4 | Depends on the ISP; CGNAT or mobile service may prevent inbound connections. | Typically supplied as part of the server service; verify the provider’s networking terms. |
| Router work | Required: forward TCP and UDP to the BeamMP host. | Residential router forwarding is skipped; configure the server host’s firewall and provider network controls. |
| Host firewall | Must allow the configured port and BeamMP-Server. | Must still allow the configured port; a VPS is not automatically open. |
| Monthly cost | Uses existing equipment and connection; additional cost is not stated. | Charged by the hosting provider; the amount depends on the selected service and region. |
| Latency | Often favorable for players near the home connection, subject to ISP routing. | Choose a geographic location near the player base to reduce network distance. |
| Administration | You maintain the PC, router, updates and power availability. | You maintain the server installation and firewall while the provider operates the underlying infrastructure. |
| Multiple servers | Each instance needs a distinct unused port and its own forwarding destination or rule. | Each instance still needs a distinct port, but no home-router rule is required. |
BeamMP specifically notes that VPS and root-server hosting can avoid the residential forwarding step. It does not remove the need to configure the server, select unused ports and permit traffic through the host firewall.
Security and exposure limits
Port forwarding exposes a service to unsolicited internet traffic. BeamMP describes forwarding as a security risk and disclaims responsibility for externally linked services. Keep the operating system and BeamMP installation maintained, use a dedicated server account where practical, and expose only the configured BeamMP port. Do not forward administrative interfaces or unrelated services just because the router offers a broad-range option.
- Forward one required port, not an entire port range.
- Enable both TCP and UDP only for that selected port.
- Keep the host firewall active and review rules after changing the port.
- Use a separate port for every BeamMP instance on the same machine.
- Remove obsolete forwarding rules when a server is retired or moved.
A complete setup checklist
- BeamMP-Server has been run once and created
ServerConfig.toml. [General]contains the intendedPort; the value is between 1024 and 65535.- No other service or BeamMP instance is using that port.
- No
BEAMMP_PORTor other environment override contradicts the file. - The server computer has a stable local IPv4 address.
- The router forwards the selected port to that address for both TCP and UDP.
- The host firewall allows BeamMP-Server or the selected port for incoming and outgoing TCP and UDP.
- BeamMP-Server is running during the test.
- CheckBeamMP is tested against the public address and selected port.
- Players receive the right address for their location: loopback, LAN or public IP.
- If home forwarding is impossible because of CGNAT or a mobile connection, the server is moved to a network with a reachable public address, such as a suitable VPS or root server.
Bottom line for BeamMP port forwarding
Use 30814 unless you have a reason to choose another unused port. Set it in ServerConfig.toml, forward it to the server computer for both TCP and UDP, permit it through the host firewall in both directions, and test while BeamMP-Server is running. If the setup still cannot be reached, check for a mismatched configuration or environment override, an unstable LAN address, firewall blocking, port conflicts and ISP-level CGNAT before rebuilding the router rule.
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