A Valheim dedicated server that closes immediately is not necessarily a game crash. It may be rejecting an invalid argument, unable to open its save directory, failing during network initialization, or throwing an exception from an outdated mod loader. Add -logFile first, preserve the last console line, then test the launch command, password, save path, world, network backend, and mods in that order. This sequence identifies the failing layer without destroying a world or overwriting the only useful evidence.
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What “crashes on startup” can mean
Valheim can stop before a world loads, exit after networking initializes, or terminate inside a mod loader. A Windows batch window that disappears and a Linux process that returns to the shell can therefore have very different causes. Argument validation often produces a clean exit that looks like a crash, while a damaged world, an unwritable directory, a firewall problem, or a BepInEx exception requires a different remedy.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteUse the first visible failure line to classify the problem:
- Exit immediately after launch: inspect the executable name, required arguments, password, quoting, and save-directory permissions.
- Stops while loading a world: test a new temporary world and verify the existing world files from a backup.
- Reaches a listening or networking message, then fails: check firewall rules, port use, and the selected backend.
- Fails only with BepInEx or plugins installed: treat the installation as a version-compatibility problem until a clean server proves otherwise.
Do not repeatedly restart while replacing the same log. The final line before exit is often the only distinction between these cases.
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1. Capture the exact error before changing anything
Iron Gate’s dedicated-server instructions document the -logFile argument. Add it to the copied launch script and point it to a location the server account can write. Keep the complete output, including the final line before the process closes.
Windows example
valheim_server.exe -nographics -batchmode -name "My Server" -port 2456 -world "MyWorld" -password "LongerPass" -savedir "D:ValheimData" -logFile "D:ValheimDataserver.log"Run the batch file from a Command Prompt while diagnosing so the console remains visible. The command above is an example layout: preserve the executable and options used by your installation, but verify every value and quote names containing spaces.
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./valheim_server.x86_64 -nographics -batchmode -name "My Server" -port 2456 -world "MyWorld" -password "LongerPass" -savedir "$HOME/valheim-data" -logFile "$HOME/valheim-data/server.log"On Linux, launch the shell script from a terminal or use a service manager that records standard output. Confirm that the log directory exists and is writable by the account running the server. Save a copy of the log before trying another launch.
What to record
- The exact server build installed when the failure occurred.
- The complete launch line, with the password redacted in any copy shared publicly.
- The last 20–30 console lines and the path of the log file.
- Whether BepInEx or other third-party files are present.
- Whether the failure began immediately after a Valheim or mod update.
This record makes later tests reproducible and prevents a second attempt from hiding the original error.
2. Validate the launch line and password
A malformed launch line is the most common explanation for a script that opens and closes. Confirm that the executable matches the platform: valheim_server.exe on Windows or valheim_server.x86_64 on Linux. Check that -name and -world each have a value, that names with spaces are quoted, and that the -savedir path has no typographical error.
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Password rules that stop startup
Community troubleshooting reports identify three validation failures that can terminate the start script:
-passwordis missing.- The password is shorter than five characters.
- The password appears in the server name.
Use at least five characters and choose a value unrelated to both the server name and the world name. “Unrelated” is safer than merely changing capitalization: do not embed the password, or a distinctive portion of it, in either name. Keep the password inside quotes if it contains shell-special characters, and avoid characters that your batch or shell syntax interprets unless you know how to escape them.
Check each argument in isolation
- Copy the original script before editing it; Steam updates can restore the original file.
- Verify the executable path and run the server from its installation directory.
- Replace the password with a temporary five-or-more-character value that is not present in either name.
- Use simple names such as
TestServerandTestWorldwhile diagnosing quoting problems. - Confirm that the selected port is written as a number and that no option is accidentally joined to the preceding value.
- Add
-logFilelast, then run once and preserve the output.
If the process now stays open, restore your preferred names one at a time. The change that reintroduces the exit identifies the invalid value rather than masking it with repeated restarts.
3. Check the save directory and world files
Valheim must be able to create or open its save directory before it can load a world. Iron Gate documents these default locations:
| Platform | Default location | What to verify |
|---|---|---|
| Windows | %USERPROFILE%/AppData/LocalLow/IronGate/Valheim |
The Windows user running the server can read and write the directory. |
| Linux | ~/.config/unity3d/IronGate/Valheim |
The service or shell account owns, or has write permission for, the path. |
If you use -savedir, that override replaces the default location for the server process. Create the directory first, use an absolute path while diagnosing, and check permissions from the same account that launches the server. A path that exists for an administrator may still be inaccessible to a dedicated service account.
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Protect the original world
- Stop the server and copy the entire save directory before renaming, moving, or deleting anything.
- Keep the backup outside the active save path so the server cannot overwrite both copies.
- Check that world files are present where the selected
-savedirpoints, not only in the platform default directory. - Restore a known-good backup rather than deleting the original world when a file appears damaged.
Do not remove a world file as a first test. A missing or mistyped path can look identical to a corrupt world, and deletion removes the easiest recovery option.
4. Test a new world to separate save corruption from installation faults
Use a temporary world name while leaving the original files untouched. Keep the same executable, password, save directory, port, and backend so that only the world variable changes.
- Stop the process with
Ctrl+Cwhen possible and wait for it to finish closing. - Back up the active save directory.
- Change only
-worldto a new name, such asStartupTest. - Launch with
-logFileand watch whether the server reaches normal world initialization. - If the temporary world starts, stop it cleanly, restore the original world name, and try a known-good backup of that world.
A temporary world that also fails points back to arguments, permissions, networking, or mods. A temporary world that starts implicates the original world or its location. Keep the successful test world until the original is recovered; it is a useful control for future updates.
5. Distinguish Steam networking from Crossplay
Networking can fail after the executable and world have initialized, so do not treat an unreachable server as proof that startup crashed. For the Steam backend, Valheim uses the configured port and the next port. Iron Gate’s guide states: “Valheim uses the specified Port AND specified Port+1.” The default range is 2456–2457.
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Steam backend checklist
- Allow the dedicated-server executable through the host firewall on the required network profiles.
- Make the configured port and the immediately following port available; with the default, that means 2456 and 2457.
- Check for another Valheim instance or unrelated service already using either port.
- Confirm that the port in the script is the port you opened in the firewall and, where applicable, on the router.
A firewall block normally prevents clients from connecting; it does not explain an argument-validation exit before world loading. Use the log timestamp and the last initialization message to tell these stages apart.
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Crossplay behavior
When -crossplay is intentional, Valheim uses a relay for outside-LAN access. Router port forwarding is not required for that access path. Local loopback and LAN assumptions differ from Steam-backend behavior, so test from the client location you actually need: the same machine, the local network, and an outside connection are separate checks.
Do not add or remove -crossplay while simultaneously changing the world, password, and mods. Change one variable, capture a new log, and record which backend was active.
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The Valheim-Modding troubleshooting guide warns that game updates can break BepInEx packs and that an incompatible version can crash a modded server during startup. The fastest isolation test is a clean, unmodded, version-matched server.
- Stop the server cleanly.
- Copy the complete server directory and the save directory.
- Move the BepInEx folder and third-party plugin files out of the active installation; do not permanently delete them.
- Verify the base server files and launch with the same world, password, save path, and backend.
- If the clean server starts, check that the installed Valheim build is supported by the BepInEx pack and by every plugin.
- Restore the loader, then add plugins incrementally, launching and logging after each small group or individual file.
If the clean server still exits, mods are not the immediate cause. If one restored plugin reproduces the failure, keep it disabled until its author supports the installed Valheim build. A game update can make a previously working pack fail without any change to your launch script.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.7. Windows and Linux permission checks
Windows
Run the script from a Command Prompt to see validation messages that would be hidden when a batch window closes. Check the security properties of the installation and -savedir directories for the account that launches the server. If the log path is on a protected location, redirect it to a directory you can write and read directly.
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Confirm the binary is the Linux executable and that it has execute permission. A service definition may run under a different user and home directory than your interactive shell; verify that user’s HOME, save path, and ownership. Relative paths are especially risky under a service manager, so use an absolute -savedir and log path during diagnosis.
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8. Preserve backups and make the installation reproducible
Keep a custom copy of the startup script because Steam updates can reset the original. Store the script, server build, launch arguments, save path, backend choice, and mod list together with each backup. That record lets you recreate the exact state that worked.
Iron Gate’s documented defaults include a 1,800-second (30-minute) save interval, a 7,200-second (2-hour) short-backup interval, and a 43,200-second (12-hour) long-backup interval. These are defaults, not a guarantee that every installation currently retains them; check your configuration and keep independent copies for important worlds.
- Use
Ctrl+Cfor normal shutdown whenever possible so the server can finish its save operation. - Do not overwrite the only backup with a copy made after a failed launch.
- Record whether a backup was made before or after a Valheim update.
- Retain at least one known-good unmodded test configuration for future comparisons.
Decision table: match the symptom to the next test
| Observed behavior | Most useful comparison | Next action |
|---|---|---|
| Process exits before any world-loading message | Valid versus intentionally invalid password and arguments | Correct the password, quoting, executable, and -savedir; capture -logFile output. |
| Original world fails, temporary world starts | Existing world versus new world | Restore a known-good original-world backup and verify its save path. |
| Clean server starts, modded server exits | Unmodded versus BepInEx installation | Verify version support and reintroduce plugins incrementally. |
| Server initializes but clients cannot connect through Steam | Steam backend versus Crossplay relay | Allow the executable and open the configured port plus the next port. |
| Crossplay works externally but local testing fails | Outside-LAN relay versus local loopback/LAN | Test from the intended client location; do not infer a startup failure from local reachability. |
| Failure begins immediately after an update | Pre-update backup/build versus current installation | Test a clean, version-matched server and then check BepInEx compatibility. |
When managed hosting is the practical alternative
Running a dedicated server yourself means maintaining launch scripts, updates, permissions, backups, firewall rules, and mod compatibility. If those tasks cannot be performed consistently, a managed Valheim service can shift routine administration to the host. Evaluate any service on whether it exposes logs, supports world backups and restores, identifies the installed Valheim build, and lets you control the backend and mod files. The operational requirements remain the same; they are simply handled through a provider’s panel or support process.
Quick Recap
Final troubleshooting order
- Add
-logFileand preserve the final console line. - Confirm the platform executable, quoted names, password length, password uniqueness, port, and writable
-savedir. - Back up the world, then test a new temporary world.
- For Steam, allow the executable and make the configured port plus the next port available; for Crossplay, confirm the relay option is intentional.
- Remove BepInEx and plugins, prove the base server starts, and restore compatible mods one at a time.
- Copy the working script and record the build, arguments, paths, backend, and mod list alongside automatic and manual backups.
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