If Don’t Starve Together says “Server is not responding,” start by checking that every player and the host use the same game branch, then update and restart the dedicated server. If that does not help, test the connection directly by IP, check firewalls and router rules, and disable mods. Those checks separate the three most common causes: a build mismatch, a blocked network path, or a mod that prevents the world from starting.
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The procedure below applies to a hosted game and to a dedicated server. Caves, large worlds, a distant host, and heavily loaded hardware can add a second layer of trouble because caves run as another server process.
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What “server not responding” usually means
The message is a connection symptom, not a diagnosis. The client may be unable to find the server, may reach it but fail the handshake, or may connect to a process that stopped while starting the world. Community reports most often point to one of these causes:
| Likely cause | What you may see | Best first check |
|---|---|---|
| Different branch or build | A player is rejected immediately, or a join attempt ends with a quick kick. | Compare Steam Beta Participation on every PC and return everyone to the same branch. |
| Out-of-date dedicated server | The server appears online but disconnects as soon as a player joins. | Run Steam’s update for the dedicated-server installation, then restart it. |
| Firewall, router, or security software block | The server works locally but cannot be reached from another network, or it never appears in the list. | Check the host PC firewall and every router or firewall between the two machines. |
| Faulty mod | The server fails while starting a world, often after a mod update or configuration change. | Disable every mod, start a clean world, then add mods back one at a time. |
| Shard, hardware, or load problem | Overworld starts slowly, caves fail, or the host becomes unresponsive under load. | Test without caves and with a smaller or unmodded world. |
Do not make several unrelated changes at once. A controlled sequence gives you a known working state and tells you which change fixed the problem.
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Prepare a clean test
Before changing settings, write down the current arrangement. You need to know whether the problem is limited to one player or affects everyone, whether the host is running the normal in-game Host Game option or a dedicated server, whether caves are enabled, and which mods are active. Ask one player on the same local network and one player on a different network to try, if possible. A local success with a remote failure strongly suggests a router or firewall path; failure for everyone points more toward the server process, branch, or world configuration.
- Close the game on all clients before changing branches or updating files.
- Keep the server’s cluster name and slot number. You will need the slot number if logs are requested.
- Back up the cluster folder before editing configuration or removing mods.
- Record whether the error occurs while listing the server, while joining, or during world startup.
For the first test, use a new or known-good world with caves disabled and no mods. This does not erase your real world; it establishes whether the basic server and network path work.
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1. Put every player and the host on the same branch
A branch mismatch is the quickest fix reported for this message. One December 2025 Klei forum report describes the error disappearing after Steam Beta Participation was changed back to Normal. The important rule is not specifically “Normal,” however: the host, dedicated server, and every joining player must use the same branch and compatible build.
- Exit Don’t Starve Together and stop the dedicated-server process.
- In Steam, open the game’s Properties, then Betas (or the current Steam label for beta participation).
- Check which branch is selected on the host and on each player’s PC.
- Choose the same branch everywhere. If nobody intentionally uses a test branch, select Normal.
- Allow Steam to finish any download, then launch the game and server again.
A branch change can trigger a download or a file validation. Wait for Steam to finish rather than starting the server with a partially updated installation. If one player still receives a quick kick, check that player’s branch again; a single mismatched client is enough to reproduce the failure.
2. Update and restart the dedicated server
A dedicated server is a separate installation from the game client. Updating the client alone does not necessarily update the server files. A host guide reports that a version mismatch often looks like a very short connection followed by a kick.
- Stop every dedicated-server process, including a second process left running in the background.
- Open Steam and locate the dedicated-server tool or installation used by the host.
- Run Steam’s Update action for that server installation. If Steam shows a pending download, let it complete.
- Start the server again and wait until it has finished loading before asking a player to join.
- Have the client restart Steam as well so it receives any matching game update.
If the server still rejects everyone immediately after an update, do not assume the update failed. Move to the direct-IP test below; it distinguishes a listing or matchmaking problem from a process that cannot accept a connection.
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3. Check the complete firewall and router path
There may be several independent filters: the Windows firewall on the host, security software, a router in front of the host, and another firewall or router between the client and server. Klei forum guidance specifically recommends checking both the PC firewall and any firewall or router in the path.
Use a temporary firewall shutdown only as a diagnosis
Temporarily disabling the host firewall can answer one question: does the connection begin working when that filter is removed? This is a short test, not a permanent configuration. Disconnect untrusted networks where possible, run one join attempt, and immediately turn the firewall back on. If the test changes the result, create a narrow allow rule instead of leaving protection disabled.
Create targeted allow rules
- Turn the firewall back on.
- Allow Don’t Starve Together and the dedicated-server executable through the host PC’s firewall on the network profiles you actually use.
- Apply the rule to the correct executable and installation. A rule for the game client does not automatically cover a separate dedicated-server process.
- On the router, forward only the server ports required by the game’s current configuration to the host’s local address. Do not forward unrelated ports.
- Save the router change, restart the server, and test again from outside the host’s local network.
Router interfaces use different labels, so the exact menu name varies. The principle is the same: reserve or identify the host’s local address, forward the configured server port to that address, and ensure no second router is silently blocking the traffic. If the host is behind carrier-grade NAT or another upstream network you do not control, ordinary port forwarding may not be sufficient; test with a direct connection on the same network and collect logs before changing more settings.
4. Whitelist the game in antivirus and router security
A Steam community guide advises allowing Don’t Starve Together in antivirus controls as well as router settings. Security products can block a newly updated executable even when the operating-system firewall rule looks correct.
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- Check quarantine or blocked-application history for a recent entry involving either executable.
- After an update, confirm that the allowlist points to the current file rather than an old installation path.
- Re-test with the same clean, no-mod world used in the earlier steps.
Do not permanently exclude an entire drive or disable all security scanning to solve one connection. A rule for the two required executables is safer and easier to undo.
5. Try administrator permissions when Windows blocks startup
One forum user reported success after setting both dontstarve_dedicated_server_nullrenderer.exe and dontstarve_steam.exe to run as administrator, while also granting firewall permission on both PCs. This is a single anecdotal report, so treat it as a diagnostic step rather than a universal requirement.
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- Close the game and stop the server.
- Locate
dontstarve_dedicated_server_nullrenderer.exeanddontstarve_steam.exein the installation used by the host. - Open each file’s Properties, select the Compatibility tab, and enable Run this program as an administrator.
- Apply the change, then confirm that the firewall allows both programs.
- Start the server and test one connection.
If administrator mode makes no difference, revert it unless your normal server setup requires it. Elevated permissions do not repair a branch mismatch, a blocked router port, or a broken mod.
6. Test a direct IP connection early
The server browser or matchmaking list can fail even when the server itself is healthy. Conversely, a server can appear in a list while its process is unable to complete a handshake. A direct-IP test removes the listing step and is one of the fastest ways to locate the fault.
- Start the server and wait for the world to finish loading.
- On the client, open the game console from the main menu.
- Use the game’s connect command and enter the host’s reachable IP address and configured server port.
- Attempt one connection from the same local network, then, if appropriate, from the remote network.
Interpret the result rather than repeating it indefinitely:
| Direct-IP result | What it indicates | Next action |
|---|---|---|
| Direct connection works, browser listing does not | The server is running; discovery or matchmaking is the likely fault. | Keep using the direct address temporarily and review router or listing settings. |
| Local direct connection works, remote direct connection fails | The server process is probably healthy, but a router, NAT, or firewall blocks the outside path. | Recheck forwarding, upstream firewalls, and the host’s public reachability. |
| Direct connection fails for everyone | The issue is likely the server process, build, world, shard, or a local security rule. | Continue with the clean-world and mod-isolation tests. |
Use the address that is reachable from the client’s network. A private local address will not work for a player connecting from the internet unless the network provides a suitable route.
7. Isolate mods before changing the world
A mod can prevent a server from finishing startup, especially after the game or the mod itself updates. The reliable isolation method is binary and repeatable: remove all variables, then add them back individually.
- Stop the server and note the active mod list and settings.
- Disable every mod for the cluster. Do not leave one “probably harmless” mod enabled during the first test.
- Start the server with a clean, unmodded world or a backed-up copy of the affected cluster.
- Join from a client that is also using no mods.
- If the clean server works, stop it and enable one mod.
- Restart and test after each individual mod. Record the first mod that reproduces the failure.
When a particular mod fails, check whether the host and clients have the same version and configuration. Remove or update that mod, then retest before restoring the rest. If the server fails even with every mod disabled, mods are not the primary cause; return to branch, update, network, and shard checks.
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8. Verify the cave shard configuration
Caves are not just another room in the overworld. They run as a second server process and add CPU, memory, and startup work. A guide reports that the overworld and caves require shard_enabled = true under the [SHARD] section of cluster.ini for the cave shard to connect correctly.
- Stop the server and make a backup of the cluster folder.
- Open the cluster’s
cluster.inifile. - Find the
[SHARD]section. - Confirm that the setting is written as
shard_enabled = true. - Save the file, start the server, and wait for both the overworld and cave processes to initialize.
If you cannot confirm the shard setup, disable caves temporarily and start the overworld alone. A successful no-caves test points to shard configuration or resource load rather than a basic internet connection. Restore caves only after the single-shard server is stable.
9. Reduce hardware and world load
Community troubleshooting reports also identify hardware load, the distance from the host, world size, and caves as contributing factors. These are not proof of a specific performance threshold; they are reasons to simplify the test.
- Stop other demanding programs on the host.
- Test a smaller or newly generated world.
- Run without caves, then compare startup and joining behavior.
- Ask a nearby player to connect before testing a player who is geographically distant.
- Watch whether the host becomes unresponsive while the world or cave process is starting.
If a small, nearby, no-cave world works but the normal cluster does not, add complexity back one item at a time: first the original world, then caves, then mods. This identifies whether the trigger is world size, the second shard, or a particular mod rather than treating every failure as a port problem.
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10. Restart the PC and server cleanly
One player reported that restarting the PC resolved a “Dedicated Server Failed to Start” error. It is anecdotal, but a restart is low effort and clears a stuck process, pending file lock, or incomplete update.
- Stop the server normally and close Steam.
- Restart the host PC.
- Restart the client PC if it has been running through several failed update or branch changes.
- Open Steam, allow all downloads to finish, and start only one server instance.
- Test with the clean configuration before restoring caves or mods.
Check the task list after restarting if the server still behaves as though an older instance is running. Two instances using the same cluster or port can produce confusing connection and startup errors.
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Use logs when the basic sequence fails
Forum moderators commonly ask for logs from both sides because a client log alone cannot show why the server process stopped, and a server log alone cannot show what the connecting PC experienced.
Client log
Collect client_log.txt from the PC that cannot connect. Include the time of a fresh failed attempt so the relevant section is easy to find.
Server log
Collect server_log.txt from the hosting PC. The file is in a Cluster_# folder under DocumentsKleiDoNotStarveTogether; the number corresponds to that server’s slot in the Host Game screen.
What to include with the logs
- Whether the server is an in-game host or a dedicated server.
- The branch selected in Steam on the host and client.
- Whether the dedicated server was updated immediately before testing.
- Whether direct-IP connection worked locally or remotely.
- Whether the clean no-mod, no-cave test succeeded.
- The approximate time of the failure and the exact wording shown by the game.
Remove passwords, private addresses, or other information you do not want to share. Do not edit out the error lines themselves; context around the failure is often what identifies a shard or startup issue.
A practical order of operations
| Step | Effort | Risk | Targets |
|---|---|---|---|
| Match branches | Low | Low | Client and server build compatibility |
| Update dedicated server | Low | Low | Server files and version mismatch |
| Direct-IP test | Low | Low | Listing versus actual connectivity |
| Allow executables in firewall and antivirus | Medium | Medium | Host security filters |
| Router forwarding check | Medium | Higher | Internet path and NAT |
| Disable all mods | Medium | Low if the cluster is backed up | World startup and mod compatibility |
| Disable caves and test a smaller world | Medium | Low | Shard setup and hardware load |
| Administrator compatibility setting | Low | Medium | Windows permissions |
| Restart the PC | Low | Low | Stuck processes and pending updates |
Follow the rows from top to bottom unless the symptom clearly points elsewhere. Build and server updates are safer than broad firewall changes, while direct-IP testing gives useful information without changing the installation.
When to stop changing settings
If matching branches, updating the server, a clean no-mod/no-cave test, and a local direct-IP attempt all fail, further random port changes are unlikely to help. Preserve the logs, the cluster slot number, and the exact reproduction steps. The combination of client_log.txt and server_log.txt gives a moderator or support technician the evidence needed to distinguish a failed process from a network handshake problem.
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