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SteamCMD downloads and updates the dedicated-server files; TerrariaServer is the program that actually hosts your world. Install SteamCMD, use the current Terraria server app entry from Valve’s supported-games documentation, create a separate server directory, add a configuration file, and start the executable with that file. The documented listening-port default is 7777, and Internet players also need the operating-system firewall and usually a router or cloud-firewall rule configured.
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This guide covers Windows, Linux, and macOS hosts, repeatable configuration, world creation, networking, updates, backups, multiple instances, and the failure points that prevent players from connecting.
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A Terraria server can run on a spare Windows PC, a Linux machine, macOS, or a cloud virtual machine. Steam itself does not need to be installed or logged in to for the normal dedicated-server download: SteamCMD supports anonymous server-file downloads for games that expose a dedicated-server package.
- A host that can remain online while players are expected to join.
- Administrator or sudo access so you can install SteamCMD, create the server directory, and open a firewall rule.
- Enough disk space for the server files and world backups. Keep free space for several world-save copies.
- A stable local address for the host if you will forward a router port to it.
- The Terraria version used by players. Updating the server while clients remain on an older version can prevent connections.
Steam Support states that SteamCMD is now used to download and update Steam game-server files. The exact Terraria app identifier and packaging can change, so use the current Terraria entry in Valve’s SteamCMD supported-games documentation rather than copying an old number from an unrelated tutorial.
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Choose a server folder and installation method
Use a dedicated directory whose path will not move. Avoid installing into a personal Downloads folder or a directory synchronized by cloud-storage software. A stable path keeps world references, scheduled tasks, firewall documentation, and backup scripts valid.
| Host | Suggested directory | Server executable |
|---|---|---|
| Windows | C:TerrariaServer |
TerrariaServer.exe |
| Linux | /opt/terraria-server or a directory in your home folder |
TerrariaServer |
| macOS | A dedicated folder such as ~/TerrariaServer |
TerrariaServer |
The examples use these paths, but any path without unexpected permission restrictions will work. On Linux and macOS, ensure the executable has permission to run with chmod +x TerrariaServer if the downloaded package does not already set it.
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Windows
- Download SteamCMD for Windows from Valve’s SteamCMD documentation and extract it to a permanent directory, such as
C:SteamCMD. - Create the server directory, for example
C:TerrariaServer. - Open Command Prompt. Change to the SteamCMD directory with
cd /d C:SteamCMD.
Linux
- Install the 32-bit compatibility libraries required by the SteamCMD build supplied for your distribution. Package names differ between distributions; use the distribution’s current SteamCMD instructions.
- Extract SteamCMD to a permanent directory, such as
~/steamcmd, and run it with./steamcmd.sh. - Create the server directory and give your administrative account ownership so updates do not require running the server as root.
macOS
- Download the macOS SteamCMD package from Valve’s documentation and extract it to a permanent directory.
- Open Terminal, change to that directory, and run the supplied SteamCMD launcher.
- Keep the Terraria files in a separate directory such as
~/TerrariaServer. macOS may ask for permission when an executable is first run; approve it only when you obtained the files from the official distribution.
Do not run a game server as the root account or as a Windows administrator unless a specific installation step requires elevation. A dedicated, unprivileged account limits the damage from a compromised server process.
Download the Terraria server files with SteamCMD
SteamCMD accepts commands either interactively or as startup arguments. The important sequence is to select the install directory, log in anonymously, update the current Terraria dedicated-server app, validate the download, and quit.
Windows command prompt
cd /d C:SteamCMD
steamcmd.exe +force_install_dir C:TerrariaServer +login anonymous +app_update TERRARIA_APP_ID validate +quitLinux shell
cd ~/steamcmd
./steamcmd.sh +force_install_dir /opt/terraria-server +login anonymous +app_update TERRARIA_APP_ID validate +quitmacOS Terminal
cd ~/steamcmd
./steamcmd.sh +force_install_dir ~/TerrariaServer +login anonymous +app_update TERRARIA_APP_ID validate +quitTERRARIA_APP_ID is a symbolic value in these examples, not a number you should guess. Replace it with the numeric app ID currently shown for the Terraria dedicated-server distribution in Valve’s supported-games documentation. If Valve lists a tool or a separate dedicated-server package rather than the regular game entry, use that listing and its documented command. App IDs and package layouts can change, so an old command that worked for a previous release is not proof that the same identifier remains correct.
validate checks the downloaded files and reacquires files that do not match Steam’s current manifest. Omit it on routine updates if download time matters, but use it after an interrupted download or suspected file corruption.
Confirm the download
When SteamCMD finishes, inspect the target directory. You should see the Terraria server executable and its supporting files. On Windows the executable is TerrariaServer.exe; Linux and macOS examples use TerrariaServer. If the directory is empty, SteamCMD installed into a different location, the app identifier is not the current server entry, or the command lacked permission to write there.
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Create a repeatable server configuration
A configuration file prevents you from re-entering the same choices at every launch and makes scheduled restarts practical. Create serverconfig.txt in the directory that contains the server executable, or use an absolute path to a file elsewhere.
world=C:TerrariaServerWorldsmain.wld
worldpath=C:TerrariaServerWorlds
port=7777
password=choose-a-strong-password
motd=Welcome to our Terraria world
maxplayers=16
secure=1On Linux or macOS, change the paths to their POSIX form, for example world=/opt/terraria-server/Worlds/main.wld and worldpath=/opt/terraria-server/Worlds. Keep the file readable by the account that runs the server, and protect it if it contains a password.
| Setting | Purpose | Important detail |
|---|---|---|
world= |
Loads a particular world file. | Use an existing .wld path, preferably an absolute path. |
worldpath= |
Sets the directory used for world files. | Useful when the worlds are outside the operating system’s default save directory. |
port= |
Chooses the listening port. | The documented default is 7777; every client must enter a changed port. |
password= |
Requires a password when joining. | Use a unique value and do not publish it in a public post. |
motd= |
Sets the message shown to joining players. | Keep it short enough to read in the client dialog. |
maxplayers= |
Sets the player limit. | The Official Terraria Wiki documents 16 as the default maximum; choose a lower value when the host cannot handle the load. |
secure=1 |
Enables additional cheat protection. | Use the documented secure mode unless a particular setup requires otherwise. |
Option names can also be supplied as command-line switches. The documented forms include -config, -port, -players or -maxplayers, -world, -autocreate, -pass or -password, -motd, -secure, -noupnp, and Steam-specific lobby switches such as -steam when that joining method is appropriate.
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Windows
cd /d C:TerrariaServer
TerrariaServer.exe -config serverconfig.txtLinux
cd /opt/terraria-server
./TerrariaServer -config serverconfig.txtmacOS
cd ~/TerrariaServer
./TerrariaServer -config serverconfig.txtLeave the terminal window open while testing. The console should report that the world loaded and that the server is listening. Stop it through the server console’s normal exit command rather than killing the process, so the world can save cleanly.
If you prefer a one-off launch without a file, the equivalent pattern is TerrariaServer -world /path/to/world.wld -port 7777 -maxplayers 16. A config file is safer for a long-running server because it records the intended settings and can be checked into a private administration backup.
Create a world when none exists
If the configured world file does not exist, the startup menu can create one interactively. For unattended setup, use the documented creation switches:
./TerrariaServer -autocreate 1 -world /opt/terraria-server/Worlds/new-world.wld -port 7777The values for -autocreate are 1 for a small world, 2 for a medium world, and 3 for a large world. Once creation finishes, put the resulting world path into serverconfig.txt and use the config on future starts. Do not point two simultaneous servers at the same world file; concurrent writes can corrupt it.
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Terraria’s default world-save directories differ by operating system. Windows uses the user’s Terraria Worlds directory, Linux uses ~/.local/share/Terraria/Worlds, and macOS uses ~/Library/Application Support/Terraria/Worlds. Verify the actual path on the host before copying an existing world, because a world placed in the wrong profile will not appear in the selection menu.
Open the port on the host firewall
Port 7777 is the documented default. If you set another value in the config, substitute that value everywhere: the host firewall, router or cloud firewall, and the client’s join screen.
- Windows Defender Firewall: create an inbound rule allowing the Terraria server executable or the selected TCP and UDP port. Restrict the rule to the network profiles and source addresses you actually need.
- Linux: add an inbound rule in the firewall manager used by your distribution, allowing the configured Terraria port for TCP and UDP. Then verify that the rule is active, not merely saved.
- macOS: allow incoming connections for the server executable when macOS prompts, or add an equivalent firewall exception in the system firewall settings.
- Cloud virtual machine: open the same TCP and UDP port in the provider’s security group or network firewall as well as in the operating system. Opening only one layer leaves the server unreachable.
For a private LAN, clients can usually connect to the host’s local address after the operating-system rule is in place. Internet players need the public address and an additional routing step when the host sits behind a home router.
Forward the port from a home router
- Give the server computer a reserved DHCP lease or static local address, such as
192.168.1.50, so the forwarding target does not change. - In the router’s port-forwarding page, create a rule for the configured Terraria port, normally 7777, forwarding to that local address.
- Forward both TCP and UDP unless your router’s documentation and your tested setup establish that one protocol is unnecessary.
- Save the rule, restart the server, and test from a network outside your home. Testing only from inside the same LAN can produce misleading results because some routers do not support loopback connections.
Do not expose administrative services such as remote desktop or SSH on the game port. If your Internet service uses carrier-grade NAT, inbound forwarding may not work at all; ask the provider for a public address or use a hosting arrangement that supplies one.
Connect from Terraria
- Launch Terraria on a client whose game version matches the server.
- Choose Multiplayer, then Join via IP.
- Enter the server’s local address for a LAN connection or its public address for an Internet connection.
- Enter the configured port. Use 7777 only when the server is actually listening on the default; the official documentation notes that clients must use a changed port when one is selected.
- Enter the server password if one is configured.
If the client reports that the connection timed out, first test whether the server is listening locally, then check the host firewall, router or provider firewall, and finally the address supplied to the client. A wrong world or password produces a different symptom from a blocked port.
Run the server continuously
Windows Task Scheduler
Create a task that runs under the dedicated server account, starts in C:TerrariaServer, and launches TerrariaServer.exe -config serverconfig.txt. Set it to start at boot, restart after failure, and write console output to a log if your wrapper or administration tool supports it. Avoid enabling multiple overlapping instances of the same task.
Linux systemd
Create a service unit with a dedicated user, the server directory as WorkingDirectory, and an ExecStart line such as /opt/terraria-server/TerrariaServer -config /opt/terraria-server/serverconfig.txt. Enable it at boot, inspect its journal after updates, and stop the service cleanly before replacing files.
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macOS launch agents
A launch agent can start the server for a logged-in account. Set its working directory explicitly and use the full path to TerrariaServer; relative paths are a common reason for a launch agent to start successfully but fail to find the config or world.
Update safely with SteamCMD
- Tell players to leave and stop the server cleanly.
- Back up the world files and
serverconfig.txt. - Run the same SteamCMD command with the current Terraria server app identifier and
validate. - Review the downloaded files and start the server again with the unchanged config.
- Have one client connect before announcing the server as available.
Keep a dated copy of each world before a major game update. If a new server build changes behavior, you can identify which backup and file set were active when a problem began. Never overwrite your only world copy during an update.
Backups and world migration
Back up the .wld files while the server is stopped, or use a snapshot method that guarantees a consistent file. Include the config, launch scripts, service definition, and any permissions needed to restore the instance. Store at least one copy on a different disk or machine.
When moving between operating systems, copy the world file into the destination’s chosen worldpath and update the world= entry. Do not assume Windows, Linux, and macOS use the same default save directory. Test the migrated world with the destination server before deleting the original.
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Host multiple Terraria servers
Each simultaneous instance needs its own world, config file, and listening port. For example, one instance can use server-a.txt, Worlds/a.wld, and port 7777, while a second uses server-b.txt, Worlds/b.wld, and port 7778. Open and forward each port separately, and create separate service or scheduled-task entries.
Do not share a world file between instances, and do not start two processes with the same port. If one instance stops unexpectedly, check that your restart policy did not launch a duplicate while the original process was still exiting.
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SteamCMD says the app is unavailable
Recheck Valve’s current supported-games documentation. The Terraria server may be represented by a different app or tool than an old tutorial uses. Confirm that force_install_dir points to the directory you inspected and that the account can write there. Run the command again with validate after correcting the identifier.
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The executable will not start
On Linux or macOS, verify execute permission and required compatibility libraries. On Windows, run from the server directory so dependent files can be found, and check whether security software quarantined a file. Read the first error printed by the server instead of repeatedly launching it.
The server starts but cannot find the world
Use an absolute path in world=, confirm the file extension is really .wld, and check that the service account can read the directory. If you intended to create a new world, remove the stale path from the config and use -autocreate or the interactive startup menu once.
Players on the same network can join, but Internet players cannot
The server process is probably working. Check the host firewall, router forwarding target, public address, and any cloud or ISP firewall. Confirm that the configured port is identical in all four places: config, host rule, router or provider rule, and client.
Players connect and are immediately rejected
Check the Terraria version, password, maximum-player setting, and whether the server is already full. A changed port affects discovery and connection, but it does not change the password or player limit.
The world rolls back or becomes corrupted
Stop the server cleanly, restore the newest known-good backup, and avoid running multiple instances against that world. Inspect disk space and permissions before restarting. Keep automatic backups frequent enough that losing the latest session is acceptable.
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Self-hosting versus managed hosting
Running the server yourself gives you direct operating-system access and control over files, mods, backups, and update timing. It also makes you responsible for uptime, patching, firewall rules, router forwarding, monitoring, and recovery. A managed Terraria server can remove much of that maintenance, but the provider controls the host environment and may limit operating-system access, backup policy, mod support, player capacity, or geographic placement.
| Decision factor | Self-hosted with SteamCMD | Managed server |
|---|---|---|
| Monthly cost | Uses your existing hardware or virtual-machine bill; no general price is established here. | Recurring provider charge; compare the current plan and renewal terms directly. |
| Uptime | Depends on your power, Internet connection, maintenance, and restart automation. | Depends on the provider’s infrastructure and support procedures. |
| Port forwarding | You configure the operating-system firewall and commonly the home router or cloud firewall. | Usually handled through the provider’s control panel, subject to its network design. |
| Operating-system access | Full control of files, services, scripts, and logs. | May be limited to a game panel and supported file operations. |
| Backups | You choose frequency, retention, and off-site storage. | Check whether backups are included, restorable, and retained for the period you need. |
| Mods and custom files | You control installation and compatibility, but also troubleshoot conflicts. | Support varies by provider and plan. |
| Player capacity | Limited by your hardware, bandwidth, and the configured maximum. | Limited by the selected plan and provider policy. |
| Geographic latency | Determined by your host’s location and network route. | Choose among the locations the provider offers. |
Self-hosting is the better fit when you can maintain an always-on machine and are comfortable with networking. Managed hosting is worth considering when router access, public addressing, or 24-hour maintenance is the obstacle rather than the Terraria configuration itself.
Quick Recap
Quick launch checklist
- SteamCMD is installed from Valve’s documentation.
- The current Terraria dedicated-server app or tool entry has been confirmed.
- The files are in a stable directory and the executable runs under a dedicated account.
serverconfig.txtnames the intended world, port, password, player limit, and security mode.- The world exists, or it was created with the startup menu or
-autocreate. - The host firewall allows the configured TCP and UDP port.
- The router or cloud firewall forwards or allows that same port when Internet access is required.
- A client has joined using the correct address, port, and password.
- The world and configuration have been backed up before the server is advertised.
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