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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCounter-Strike 1.6’s standard HLDS port is 27015. Forward UDP 27015 from your router to the server computer’s fixed local IP for game traffic. Allow TCP 27015 as well when you use RCON or a setup that requires it. Set +sv_lan 0 for Internet play, and keep the same port number in HLDS, the router, the operating-system firewall and the address players enter.
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CS 1.6 port numbers at a glance
| Purpose | Protocol | Default port | What to configure |
|---|---|---|---|
| Gameplay and client connections | UDP | 27015 | HLDS -port 27015, router/NAT forwarding and an inbound firewall rule |
| RCON and compatibility traffic | TCP | 27015 | Allow and forward TCP 27015 when your administration method or client setup needs it |
| LAN-only hosting | UDP (normally) | 27015 unless changed | Run with +sv_lan 1; no Internet-facing forwarding is required |
Valve’s GoldSrc command-line documentation describes -port as the client-connection port and gives 27015 as the default. Steam’s current required-ports guidance identifies local UDP 27015 for gameplay and local TCP 27015 for the default SRCDS RCON port. The exact behavior can vary with the GoldSrc build and networking mode, so treat TCP as required for RCON or compatibility rather than as a substitute for UDP gameplay forwarding.
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How HLDS uses the port
When a player connects, the public address and port identify the router, while the router’s forwarding rule sends the packets to the computer running HLDS. UDP is the important path for movement, hit registration, voice and other real-time game traffic. A router rule that forwards only TCP generally leaves the server unreachable for normal play.
The server must also be in Internet mode. In the launch command, +sv_lan 0 permits Internet clients; +sv_lan 1 restricts the instance to the local network. The port number is independent of that switch: a LAN server can still listen on 27015, while an Internet server can listen on another port if every related setting is changed.
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What you need before creating a forwarding rule
A stable private IP address
Port forwarding targets a local address such as 192.168.1.100. If the router’s DHCP service later gives the server PC a different address, the old rule points to the wrong machine. Use the router’s DHCP-reservation feature, often under LAN, DHCP or Address Reservation, and reserve the current address for the server’s network adapter. A manually configured static address also works, provided it is outside the DHCP pool and matches the router’s subnet, gateway and DNS settings.
A reachable public address
Traditional forwarding requires an inbound-reachable public IPv4 address. If your Internet provider places the connection behind carrier-grade NAT (CGNAT), the router may show a private or shared address on its WAN page. In that case, a rule on your home router cannot receive unsolicited traffic from the Internet. Ask the provider for a public IPv4 address, use a host with one, or use a supported relay-based networking option.
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You need the router administrator account and permission to create NAT rules. The server computer’s firewall is a separate barrier: allowing a port on the router does not override Windows Firewall, a Linux firewall or security software on the host.
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Open UDP 27015 step by step
- Find and reserve the server address. On the server PC, note its current IPv4 address. Reserve that address in the router’s DHCP settings, or configure a correctly planned static address. Do not forward to a temporary address that can change after a reboot.
- Launch HLDS in Internet mode. A typical Windows console launch is
hlds.exe -console -game cstrike +sv_lan 0 +map de_dust2. Add-port 27015explicitly if you want the chosen port visible in the launch command:hlds.exe -console -game cstrike -port 27015 +sv_lan 0 +map de_dust2. On Linux, use the equivalenthlds_runcommand with the same GoldSrc arguments. - Sign in to the router. Open the router’s administration interface and locate Port Forwarding, Port Range Forwarding, NAT or an equivalent label. Vendor terminology differs, but the rule needs an external port, an internal destination and a protocol.
- Create the UDP rule. Set the external/start and external/end ports to
27015, choose UDP, enter the server’s reserved private IP, and set the internal/destination port to27015. Save and apply the change. If the interface asks for a service name, use a descriptive label such asCS16-HLDS-UDP. - Add TCP when appropriate. Create a second rule for TCP 27015 to the same private IP when you use RCON or when a documented client or network setup requires TCP. Do not remove the UDP rule; TCP does not carry the normal gameplay path.
- Allow the host firewall. Permit inbound UDP 27015 for the HLDS executable or for the selected port. Add inbound TCP 27015 if you enabled the TCP router rule. Scope the rule to trusted administration sources where practical, especially for RCON, rather than exposing management access unnecessarily.
- Confirm that HLDS is listening. Start the server and check its console output or the operating system’s listening-socket tools. The process should be bound to the selected port, not a different instance or an accidentally selected LAN-only configuration.
- Test from outside the home network. Ask a friend on another connection to join, or test while a phone is using cellular data. Testing from another device on the same Wi-Fi can fail because many routers do not support NAT loopback (also called hairpin NAT), even when Internet players can connect.
Firewall configuration on the server computer
Windows
In Windows Security, open Firewall & network protection, choose Advanced settings, then Inbound Rules and New Rule. Select Port, choose UDP and enter 27015; allow the connection for the network profiles that apply to your server. Repeat for TCP only if needed. An alternative is an application rule for hlds.exe, but a port rule makes the selected exposure explicit. If a third-party security suite controls the firewall, create the equivalent rule there instead.
Linux
Use the firewall manager enabled on the host. For a system using UFW, the essential UDP rule is sudo ufw allow 27015/udp; add sudo ufw allow 27015/tcp only when TCP is required. With another firewall system, create the equivalent inbound rules and ensure they apply to the interface receiving Internet traffic. Keep SSH or other administration rules separate so changing the game rule does not lock you out.
Which address should players use?
| Player location | Address format | Example | Reason |
|---|---|---|---|
| Same home or school network | Private server IP plus port | 192.168.1.100:27015 |
The local route avoids dependence on NAT loopback and is the address Steam’s router guidance recommends for same-network clients. |
| Different network | Public IPv4 address plus port | 203.0.113.10:27015 |
The router receives the Internet connection and forwards it to the reserved private IP. |
| Non-default port | Public or private address plus the selected number | 203.0.113.10:27100 |
Players must specify the changed port; omitting it normally makes the game try its default. |
The public address may change unless your provider supplies a static address or you use a dynamic-DNS arrangement. If the address changes, players must use the new value. A server browser may not list a private server reliably; direct connection with the correct address and port is a better LAN test.
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Using a different port
Another application may already occupy 27015, or your provider may filter it. GoldSrc lets you select another client port with -port N. For example:
hlds.exe -console -game cstrike -port 27100 +sv_lan 0 +map de_dust2Changing the number is an all-or-nothing configuration change. Set the same value in all four places:
- HLDS’s
-port Nargument. - The router’s external and internal forwarding ports.
- The host firewall’s UDP rule, plus TCP if required.
- The address players enter, such as
public-address:N.
Steam’s router guidance suggests trying another port in its documented alternatives when 27015 is unavailable. Choose a number that is not used by another service, and record it so a later server restart does not silently return to 27015.
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Why friends cannot see or join the server
HLDS is listening on the wrong port
Check the launch command and console output. A second HLDS instance, an old shortcut or a launch script without -port can leave the server on 27015 while the router forwards a custom number, or vice versa. Stop duplicate instances and make the selected port explicit.
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sv_lan is set to 1
Internet clients cannot join a LAN-only instance. Query the server setting and start it with +sv_lan 0. Restart after changing the launch configuration so the intended mode is active.
The forwarding target changed
Compare the router rule’s destination with the server PC’s current IPv4 address. A stale DHCP lease is one of the most common causes of a previously working server becoming unreachable. Restore the reservation and update the rule if necessary.
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The host firewall is still blocking traffic
Temporarily disabling a firewall can help isolate the cause, but do not leave the machine unprotected. Instead, create a narrowly scoped HLDS or port rule and re-enable the firewall before normal use. Check whether a security suite has its own network filter.
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A failed connection from another device on the same Wi-Fi does not prove that forwarding is broken. Use the private address for LAN players and perform an external test from a separate Internet connection.
There is an upstream router or CGNAT
If the modem, mesh system or provider equipment is also routing, forward the port through each layer or place one device in a correctly configured bridge/DMZ arrangement. When the router’s WAN address differs from the public address shown by an independent address-check service, CGNAT or another upstream NAT is likely. Request a public IPv4 address or move the server to a network that can accept inbound connections.
The port is already occupied
Another game server or service may have bound 27015. Stop the conflicting process or choose a new port and update every dependent setting together. A router rule cannot make two local services share the same address and port.
Direct forwarding, managed hosting and Steam Networking
There are three practical ways to make a CS 1.6 server reachable. The right choice depends on whether you value control, simplicity, uptime or avoiding exposure of a home connection.
| Approach | Setup effort | Control and modding | Uptime and network exposure | Port forwarding/public IP | Recurring cost |
|---|---|---|---|---|---|
| Home self-hosting with direct forwarding | Highest: HLDS, router, firewall and address maintenance | Full control of files, plugins, maps and configuration | Depends on your power, connection and maintenance; exposes one service on the home network | Normally required | No hosting fee, but uses your connection and electricity |
| Managed game hosting | Lower: provider supplies the reachable server | Usually broad modding access, subject to provider limits | Provider handles datacenter connectivity and availability; your home network is not exposed | Usually not required on your router; provider assigns the endpoint | Recurring hosting charge |
| Steam Networking on a supported GoldSrc build | Potentially lower, but build and mode must support it | Depends on the supported networking implementation and server controls | Can avoid inbound home exposure; latency and path depend on relay availability and selection | May not require inbound forwarding or a public IPv4 address | Depends on the game/networking service; verify current availability |
Valve documents Steam Networking support for Counter-Strike and other GoldSrc games, including Steam Datagram Relay capabilities that can enable self-hosting without inbound forwarding. This is not a universal property of every legacy installation: verify that the current game build and selected networking mode support the relay before deleting working NAT or firewall rules. Relay routing can also change the network path and latency compared with a direct connection, and discoverability and administrative behavior may differ.
Quick Recap
Security and maintenance practices
- Forward only the port you use. Do not place the server PC in a broad DMZ as a shortcut for a missing rule.
- Keep HLDS, the operating system and server plugins updated where the installation supports updates. Remove abandoned plugins and unknown binaries.
- Use a strong RCON password and avoid exposing RCON to the entire Internet when your router or firewall can restrict source addresses. TCP 27015 should not be opened merely because a guide lists it if you do not use RCON or a feature that needs it.
- Run the server under a separate operating-system account with only the permissions it needs. Back up maps, configuration files and ban lists before changing the installation.
- Monitor bandwidth, CPU and memory. A home upload connection can become the limiting factor even when port forwarding is correct.
- Document the reserved private IP, selected port, launch command and router rule. This makes recovery after a router reset or server migration predictable.
Quick verification checklist
- HLDS starts with
+sv_lan 0for Internet play. - The selected port is explicit and matches the intended value, normally 27015.
- The server PC has a reserved or correctly static private IP.
- The router forwards UDP 27015 to that IP and port.
- TCP 27015 is forwarded only when RCON or compatibility requires it.
- The operating-system firewall permits the same protocol and port.
- LAN players test with the private address; Internet players test with the public address.
- An external-network test is successful, or CGNAT/upstream NAT has been ruled out.
- If Steam Networking is being used, the build and networking mode have been verified as supported before relying on relay hosting.
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