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To host a dedicated RimWorld Together world in 2026, download the project’s server release for Windows or Linux, or run its official container image. Open the server’s configured TCP port (25555 by default), give every player the compatible RimWorld Together client mod, and keep the client, server, and RimWorld versions aligned. The latest release identified for this guide is 26.10.4.1, published October 4, 2026.
What you need before creating the server
RimWorld Together is designed for a persistent multiplayer world in which players can run separate colonies on the same planet. It is the relevant project when you want a dedicated server process that can remain online independently of one player’s game session.
- A legal installation of RimWorld for every player.
- The RimWorld Together client mod enabled by every player.
- A Windows or Linux machine for the dedicated server. The project’s server creation guide does not support macOS as a dedicated-server operating system.
- Permission to create and modify files in the server’s data directory.
- A reachable TCP port, 25555 by default, if players will connect over a network.
- A version plan: the client release, server release, and supported RimWorld base-game version must be compatible.
The project describes hardware needs as modest but places emphasis on network bandwidth. Its reviewed documentation does not publish a verified minimum CPU, memory, bandwidth, or player-count figure, so there is no responsible universal “minimum server specification” to quote. Test the world with your expected number of players and monitor CPU, memory, disk space, and network use rather than relying on an invented threshold.
Which project should you install?
Do not mix RimWorld Together files with the separate mod named Multiplayer. They are different projects with different connection models and server support.
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| Question | RimWorld Together | Separate Multiplayer mod |
|---|---|---|
| Dedicated-server operating mode | Provides a dedicated server distribution and an official container image. | Its official release page describes the standalone server archive as intended for testing. |
| World and colony model | Its Workshop description presents multiplayer on the same planet, with separate colonies and each player’s pace. | Uses a different gameplay and synchronization approach. |
| Installation files | Use the RimWorld Together server archive or its container image, plus the RimWorld Together client mod. | Use only the files and instructions published for that project. |
| Compatibility checks | Check the current RimWorld Together release notes, client version, server version, RimWorld version, mods, and DLC. | Check that project’s own compatibility information instead of applying RimWorld Together guidance. |
If a download page or folder is labelled only “Multiplayer,” stop and verify the project before proceeding. A server that launches is not necessarily the server your clients are configured to use.
Choose a hosting method
Home computer
A home PC is suitable for a small private group when the machine can remain powered on and the host can configure its firewall and router. The software itself does not require a separate hosting subscription. The drawbacks are uptime, changing home IP addresses, upload capacity, and the need to expose a service from your household network.
Virtual private server or rented host
A VPS can provide an always-on Linux machine without exposing your home connection. The project documentation does not verify a particular provider. Before paying, confirm that the service offers a supported operating system, persistent storage, inbound TCP access on your chosen port, backups, and enough network capacity for your group. Check RimWorld Together compatibility immediately before deployment because release requirements can change.
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Container host
Docker or Podman is useful if you already manage containers. The official image stores server data under /Data; mount that path to host storage so worlds and configuration survive container recreation or upgrades.
Method 1: install the Windows or Linux server archive
1. Select the matching release asset
Open the RimWorld Together project’s official releases page and select the current server archive for the operating system that will run the process. The release list reviewed for this article includes Windows and Linux server archives. The current release observed was 26.10.4.1, dated October 4, 2026; use the release page’s current asset if it has changed since then.
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Download the server archive, not just the client mod. Every player separately needs the client-side mod in their RimWorld installation.
2. Extract it into a writable directory
Extract the archive to a normal, writable folder such as a dedicated server directory in your home or user profile. Avoid protected operating-system locations. The project warns that privileged locations can block file creation or cause security software to interfere with the server.
Keep the extracted folder intact. The server may create configuration, world, log, or mod data beside the executable, so do not run it from a temporary download directory that your operating system may clean up.
3. Start the server
On Windows, launch the server executable from the extracted folder. If Windows Defender or another security tool asks whether the program may communicate, allow the application on the network profile you actually use, subject to your own security policy.
On Linux, open a terminal in the extracted directory and run the supplied server executable. If the shell reports that it is not executable, add execute permission to that file and run it again:
chmod +x ./<server-executable>
./<server-executable>The archive’s executable name can vary by release, so replace <server-executable> with the filename that was actually included. Keep the process running while players connect. Use a service manager or terminal multiplexer only after you have confirmed that the server starts normally in the foreground.
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4. Record the server’s port and data location
RimWorld Together documents TCP port 25555 as the default and allows the port to be changed. Write down the configured value before opening firewall rules or telling players how to connect. If you change it, every later mapping and firewall rule must use the new value.
5. Install and enable the client mod
Each player should launch RimWorld with the RimWorld Together client mod enabled. The dedicated server has its own server files and mod configuration; installing the client mod alone does not create a server. Follow the current project documentation for dependencies, load order, DLC settings, and server-side mod rules.
6. Test locally before inviting the group
Join from the host or from a second machine on the same network first. Confirm that the server appears reachable, a world can be created or loaded, and the expected mod configuration is present. A local test separates game and mod problems from router and public-internet problems.
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Method 2: run the official container image
The project documents the official image ghcr.io/rimworld-together/rimworld-together:latest. Install Docker or Podman, create a host directory for persistent data, and map the host’s port to the container’s port.
1. Create persistent storage
From a directory where you keep server data, create a folder for the container’s /Data path:
mkdir -p rwt-dataOn Windows, create an equivalent folder and use the path syntax required by your container runtime. Ensure the runtime account can read and write it.
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2. Start the container
A basic Docker example using the documented port and data paths is:
Do these 3 things before closing this tab:
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--name rimworld-together
-p 25555:25555/tcp
-v "$(pwd)/rwt-data:/Data"
ghcr.io/rimworld-together/rimworld-together:latestThis publishes host TCP port 25555 to container TCP port 25555 and stores server data in rwt-data. With Podman, use the equivalent podman run command and volume syntax.
3. Check startup and persistence
Inspect the container’s logs with your runtime’s log command and confirm that the server process remains running. Stop and start the container once during testing. The world and configuration should remain in the mounted host directory; if they disappear, the volume path is wrong or not writable.
4. Control upgrades deliberately
The documented example uses the latest tag. That is convenient for a new test server, but it can change when the project publishes an update. For a controlled upgrade, use an image tag that the project publishes for the release you have selected, record the old image and data backup, and change versions only after reading the release notes. Do not invent a tag name if the release page does not list it.
Configure the network correctly
Understand the default endpoint
The documented default is TCP 25555. The reviewed documentation does not support substituting UDP. If you choose another port, configure the server, firewall, router, and container mapping consistently.
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| Deployment | What must match |
|---|---|
| Windows or Linux archive on a home network | Server port, operating-system firewall rule, router port-forward rule, and the port entered by clients. |
| Container on a home network | Server’s internal port, container port, host-to-container mapping, host firewall rule, router rule, and client endpoint. |
| VPS or rented host | Server port, provider firewall or security group, machine firewall, and client endpoint. |
| Private VPN network | Server port reachable over the VPN address and a route that allows every player to reach the host. |
Open a home router and firewall
- Give the server machine a stable local address, preferably through a DHCP reservation.
- Allow the configured TCP port through the machine’s firewall.
- Create a router port-forward from the chosen public TCP port to the server machine’s local address and port.
- Restart or reload the server if its configuration requires that after a port change.
- Test from outside the home network. Testing only from the same LAN can succeed even when public forwarding is incorrect.
Do not publish more ports than necessary. If your internet service uses carrier-grade NAT or blocks inbound connections, ordinary forwarding may not work; use a reachable host or a private VPN arrangement instead.
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Use a VPN for a private group
The project README mentions VPN software as a workaround when players cannot configure router forwarding. Choose a trusted VPN solution, install it for every participant, and verify that the server’s configured TCP port is reachable through the VPN address. A VPN does not remove the need for compatible client and server versions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Set up mods, DLC, and synchronization
Start with the smallest supported configuration: the RimWorld base game and RimWorld Together client mod. Add other mods only after the unmodified connection works.
- Compare the enabled client mod list with the server’s configured mod rules.
- Confirm that every player owns and has enabled any DLC required by the world.
- Check the current release notes for dependency changes and supported RimWorld versions.
- Do not assume that a single-player RimWorld mod is multiplayer-safe. Some mods alter world state, UI, ticking, or saves in ways a dedicated server cannot synchronize.
Release 26.10.4.1 mentions improved mod-configuration synchronization and an initial rollout of automatic mod downloads. The notes describe that rollout as ongoing, so treat automatic installation as a feature that may not be available to every setup. Have players install required mods manually unless the current release documentation explicitly confirms otherwise for your version.
Back up the server data before changing a mod list, DLC setting, image tag, or server release. A backup should include the world and the configuration needed to reproduce the working setup.
Keep versions compatible
Compatibility is a three-way check: RimWorld Together client release, RimWorld Together server release, and the RimWorld base-game version supported by that release. The material available for release 26.10.4.1 does not establish a specific base-game version, so verify it in the current release notes rather than assuming the latest game build is correct.
- Write down the server release currently installed.
- Open that release’s notes and identify the supported RimWorld version and any migration instructions.
- Make every player install the matching client mod release.
- Compare mod and DLC settings before loading an existing world.
- Back up the data directory.
- Upgrade the server and clients together, then test with a copy of the world before switching the live server.
If a new server release is available, do not overwrite a working installation immediately. Keep the old archive or image reference, preserve the data backup, and make sure you can roll back if the world or mod configuration fails to load.
Troubleshoot the most common failures
The server will not start
- Confirm that you extracted the correct Windows or Linux server archive.
- Move the installation to a writable directory and check file permissions.
- On Linux, verify execute permission on the server binary.
- Review security-software alerts and allow the executable only as appropriate.
- For containers, inspect logs and verify that the mounted
/Datadirectory is writable.
Players cannot connect
- Confirm that the server process is still running.
- Check that clients are using TCP, not UDP, and that they have the exact configured port.
- Verify the host firewall, router forwarding, provider firewall, or VPN route.
- For containers, confirm that the host-to-container mapping is
25555:25555or matches your chosen port. - Test from a network outside the host’s LAN.
Players connect but receive version or mod errors
- Confirm that the client mod and server release belong to RimWorld Together.
- Check the RimWorld base-game version in the current release notes.
- Compare mod order, enabled mods, dependencies, and DLC ownership.
- Do not rely on automatic mod downloads unless the release documentation confirms that the staged feature covers your setup.
The world or settings vanished after a container restart
Inspect the volume mount first. The host directory must be mapped to /Data, and the runtime account must be able to write there. A container that runs without a persistent mount can create data inside its writable layer, which is lost when the container is removed.
An update broke an existing world
Stop the server, restore the pre-update data backup, and return to the previously working server archive or image. Read the release-specific migration notes before trying the update again. Never test an unverified upgrade only on the sole copy of a long-running world.
Operational checklist for a persistent server
- Keep the server machine or container host powered on and connected.
- Record the configured TCP port and the location of the data directory.
- Back up the world and configuration before releases, mod changes, or DLC changes.
- Limit firewall exposure to the port and networks your players actually need.
- Monitor available disk space, process status, and network stability.
- Tell players which RimWorld Together client release and mod set to use.
- Read current release notes before upgrading; version, compatibility, and container tags can change.
Final decision: which route fits your group?
| Choose this route | When it makes sense | Main responsibility |
|---|---|---|
| Windows or Linux archive at home | Small private group, available host machine, and ability to configure forwarding. | Keep the process running and maintain firewall/router access. |
| Windows or Linux archive on a VPS | You need persistent uptime or do not want to expose a home connection. | Pay for and secure a host with persistent storage and inbound TCP access. |
| Official container image | You already use Docker or Podman and want repeatable deployment. | Maintain the port mapping, persistent /Data volume, image version, and backups. |
| Private VPN connection | Players cannot configure public router forwarding and are comfortable joining one private network. | Ensure every player can route to the host and reach its configured TCP port. |
For most small groups, begin with the archive on a writable Windows or Linux machine, prove that a local connection works, and then expose only the configured TCP port. Move to a VPS or container when uptime, isolation, or repeatable upgrades matter more than the simplicity of a desktop launch.
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