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Find the last successful startup stage before changing anything. Save the complete console output, the file produced with -logfile, the newest crash information, server.cfg, the server identity folder, map details, Oxide version and plugin list. A server that never reaches “Server startup complete” has a different problem from one that boots successfully and later exits. Test an updated, unmodded server first, then restore configuration, maps, Oxide and plugins one layer at a time. This process identifies whether RustDedicated, SteamCMD files, a setting, a custom map, a plugin or the host process is responsible instead of guessing.
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What a Rust server crash usually means
A dedicated server can stop at several different layers:
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- World or map generation: a custom map download, prefab or path-generation job fails before the world is ready.
- Configuration: an invalid or obsolete value in
server.cfgprevents initialization or creates a bad runtime state. - Oxide and plugins: a mod framework or plugin is incompatible with the current server build, or a plugin fails while loading or during an event.
- Host conditions: the operating system, permissions, scheduled task, resource exhaustion or a host restart terminates the process.
- Client-only failure: the administrator’s copy of Rust or Steam fails even though the dedicated server is healthy.
Facepunch’s server-creation guidance says startup can display errors that are harmless while the process continues. The meaningful milestone is the exact line “Server startup complete”. Treat that line as the boundary between boot-time diagnosis and runtime diagnosis.
The Facepunch troubleshooting FAQ also says that “In 99% of cases, errors on startup are caused by user’s error.” That is guidance to inspect files, settings, maps and mods carefully, not a measured crash-rate statistic.
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Preserve logs before attempting repairs
Repeatedly restarting can overwrite the evidence needed to identify the first failure. Stop automatic restarts temporarily if possible and make a dated copy of the following:
- The entire console transcript from the failed launch, including lines before the final error.
- The log file created by starting the executable with
-logfile. Use a separate filename for each test so one attempt cannot hide another. - The newest crash dump or host-provided termination report.
server.cfg, the server identity directory and any launch script.- The map name or direct map URL, Rust build date or version, Oxide version and the complete plugin list.
- The timestamps of the crash, the last restart, recent updates and any scheduled task.
uMod’s logging documentation describes the daily server log in oxide/logs as containing almost all server console output and as the most useful record for finding bugs. It also keeps compiler logs there. A compiler warning by itself does not prove that the plugin caused a runtime crash, so preserve the surrounding server events and timestamp.
Classify the crash by when it happens
| Observed timing | First layer to test | Useful evidence |
|---|---|---|
| Immediate exit, before meaningful initialization | Executable files, SteamCMD update state, permissions and runtime dependencies | Final console line, operating-system event and whether a clean vanilla launch works |
| Exit during map or world generation | Custom map URL, map prefabs and ocean-path generation | Full NRE stack trace, map download response and whether a stock procedural map succeeds |
| Exit while Oxide or plugins load | Oxide provider/version and plugin files | oxide.version, plugin load lines and a no-plugin test |
| Boot reaches “Server startup complete,” then exits during play | Plugin events, map events, scheduled restarts, resource pressure and host process events | Crash timestamp matched against the daily server log and host monitoring |
| Only the administrator’s game client fails | Steam and local Rust installation | Client error text and Steam status; the dedicated-server log remains unaffected |
Do not classify a warning as the cause merely because it appears in red or near the end of the console. Match a claimed cause to the first fatal exception, the process exit timestamp or a repeatable change in behavior.
Build a clean, known-good baseline
A clean baseline is the fastest way to separate RustDedicated from your custom files. Back up first; do not delete identity data or plugin data until you know what must be restored.
- Back up state. Copy the identity folder,
server.cfg, map files or URLs, plugin data, plugin source files and all logs to a location outside the live server directory. - Update once. Use SteamCMD to update the Rust server and record the resulting build date or version. Do not place an unconditional SteamCMD update in every launch of a modded server.
- Start minimally. Launch RustDedicated with only the essential arguments for your server and a
-logfiledestination. Remove optional map, plugin and experimental arguments for this test. - Wait for the milestone. Allow the process several minutes and confirm the log contains the exact line “Server startup complete”. A slow boot is not automatically a crash.
- Run more than one check. Stop the clean process normally, start it again and compare the logs. A single successful boot can miss an intermittent file or host problem.
- Restore one layer at a time. Add the configuration, then the custom map, then Oxide, then plugins in small groups. Restart after each change and record which addition first reproduces the failure.
If the unmodded server cannot reach the milestone, do not spend time replacing plugins. Concentrate on the executable files, SteamCMD state, permissions, launch arguments and host events. If the baseline is stable, the fault is in something you add back.
Check SteamCMD and configuration traps
Do not overwrite a modded installation on every launch
Facepunch warns that running SteamCMD in a startup script can revert an Oxide installation to vanilla. The resulting server may appear to “lose” mods after every restart, or a version mismatch may occur when plugins expect Oxide files that the update removed. Update Rust deliberately, then install the matching Oxide release, verify the framework and only then start the server.
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Keep a record of the Rust build and Oxide release used together. When a Rust update arrives, first test vanilla, then apply the compatible Oxide build and test again before restoring plugins.
Review server.cfg before launch arguments
Facepunch notes that server.cfg is read at startup and takes priority over command-line values for many settings. Keep the command line limited to essential ports, RCON arguments, the log destination and other values required to launch. Review the configuration for:
- Misspelled or obsolete variables.
- Invalid map or download URLs.
- Duplicate settings whose later value silently overrides the earlier one.
- Values copied from a different Rust version or server type.
- Quotes, spaces or line breaks that change how a value is parsed.
For a controlled test, make a minimal configuration containing only the values required to identify and reach the server. Add gameplay settings in groups after the baseline succeeds. Keep the original file untouched so you can compare it line by line.
Diagnose custom-map crashes
Verify the download itself
A custom map must be available at a publicly reachable direct download URL ending in the map file. A Discord page, landing page or non-download redirect is not a valid substitute. Test the URL independently and confirm that it returns the map rather than an HTML error page. Replace a broken URL with a known-good direct one, then retry using the clean baseline.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsRead the full NRE output
When the server reports a broken prefab, capture the complete NRE stack trace rather than only its final line. The trace can identify the prefab or system that failed. Remove or replace the offending prefab in the map editor and export the map again. If the FAQ recommends a spawner prefab for a vehicle or NPC, use that spawner rather than placing the vehicle or NPC entity directly.
Handle maps without usable ocean space
Some maps stall or fail while generating ocean paths when there is no usable ocean area. Add sufficient ocean space in the map, or test the documented workaround:
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baseboat.generate_paths false
cargoship.event_enabled falseApply those settings only when the log and map layout match this specific ocean-path case. They disable systems; they are not a general fix for arbitrary map errors. Restore each setting separately after testing if the map is corrected.
Separate map faults from configuration faults
Run the same configuration with a stock procedural map. If the procedural map reaches “Server startup complete” but the custom map does not, focus on the map URL, prefabs and path generation. If both fail at the same stage, the map is unlikely to be the primary cause.
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Isolate Oxide and plugins safely
Confirm the provider and framework
uMod requires a server provider capable of Oxide 2.0 or higher. Start the server without plugins and check the reported framework with oxide.version. If that command is unavailable or the provider does not support the required Oxide generation, resolve that compatibility issue before editing plugin code.
Plugins normally reside in oxide/plugins. Replacing a plugin’s .cs file loads the updated version automatically when Oxide is installed, but make a backup and watch the next startup log for compile or load errors.
Use a controlled plugin matrix
- Stop the server and copy the entire
oxidedirectory, including data and configuration. - Move all plugin
.csfiles out ofoxide/pluginsto a quarantine folder outside the live tree. Do not erase their data yet. - Start the server and confirm whether it reaches “Server startup complete” and remains stable.
- If it is stable, restore plugins in small, named groups. Put recently updated, event-heavy or map-dependent plugins in their own test group.
- When a group reproduces the crash, halve that group and repeat until one plugin or interaction remains.
- Compare that plugin’s current release with the Rust build and Oxide version. Replace an outdated
.csfile with a current version, then test again.
Keep a changelog containing the date, Rust build, Oxide version and every plugin addition or update. It turns a random crash into a reproducible “stable until plugin X was added” record.
Interpret compiler messages correctly
A compiler notification means a plugin may not have loaded; it does not establish that the running server later crashed because of that file. Check whether the plugin actually loaded, whether its hooks execute at the crash time and whether removing it makes the failure disappear repeatedly.
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Check listing policy after restoring mods
Facepunch’s policy updated March 4, 2026 says plugins that modify gameplay or the user interface belong under the Modded listing, except for limited Community-server cases. After restoring such plugins, verify that the server’s listing category and description comply with that policy. A listing issue does not normally explain a process crash, but it can make a repaired server appear unavailable or misclassified.
Investigate crashes that happen after a successful boot
For a random crash, correlate the exact exit time with the daily server log, host process log and any scheduled task. Look for a repeating trigger rather than the last warning printed:
- A plugin hook that runs when a player joins, an event starts, an entity spawns or a timer fires.
- A map event or custom prefab loaded only after play begins.
- A scheduled restart, update job, backup task or operating-system maintenance event.
- Memory or CPU pressure, an operating-system kill event, disk-full condition or permission failure while writing logs.
- A Rust or Oxide update that changed behavior since the last stable run.
Run a no-plugin server on the same map and host for a comparable period. Then run the plugin set on a stock map. These two tests distinguish a plugin event from a map-specific event. If the process still exits on a clean vanilla server, send the host the complete log and host event rather than deleting random files.
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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Do not treat a single warning as proof. uMod explicitly says warnings are usually safe to ignore, and compiler logs alone are insufficient to diagnose a runtime failure. A useful correlation has a timestamp, a repeatable trigger and a change that removes the failure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Separate a client “Steam not open?” error from a server crash
If only the administrator’s Rust client reports “Steam not open?”, the dedicated process is not necessarily broken. Facepunch’s client troubleshooting sequence, updated August 23, 2024, is:
- Close and restart Steam.
- Install any pending Steam updates.
- Opt out of Steam beta participation.
- Verify Rust’s files through Steam.
- Perform a fresh Rust installation if the earlier steps do not resolve the error.
Client verification cannot repair a RustDedicated process that exits on the host. For that case, use the server’s console, -logfile output, baseline test and host process records.
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Use evidence to choose the next remedy
| Evidence pattern | Next action | Avoid |
|---|---|---|
| Vanilla fails before startup completion | Validate SteamCMD files, launch arguments, permissions, dependencies and host events | Deleting plugins or buying hardware without a resource or event record |
Vanilla works; adding server.cfg fails |
Reduce the file to essential settings and add values back in groups | Assuming the command line overrides every configuration value |
| Procedural map works; custom map fails | Test the direct URL, inspect the NRE trace, repair prefabs and check ocean-path requirements | Disabling unrelated plugins first |
| No-plugin Oxide works; one plugin group fails | Binary-search the group, update the identified plugin and compare versions | Calling every compiler warning a crash cause |
| All tests work until a scheduled time | Match the timestamp with restart, backup, update and operating-system tasks | Blaming the last in-game warning without checking host events |
| Only one PC shows “Steam not open?” | Follow Steam restart, update, beta opt-out, verification and reinstall steps | Reinstalling the dedicated server |
What to send a server host or plugin author
Send one self-contained report instead of screenshots of the final error line. Include:
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- The UTC timestamp and time zone of each failure.
- The complete console transcript and the matching
-logfilefile. - The newest crash dump or host termination event.
- Rust build date/version, operating system, Oxide version and provider type.
- The exact launch command with passwords and private tokens removed.
server.cfg, map name and direct map URL, identity-folder details and plugin list.- The last successful test: for example, “vanilla procedural map reached startup completion; custom map failed during NRE prefab loading.”
- Every change made immediately before the first failure and the result of removing that change.
Keep original files read-only or in a backup while testing copies. This lets the recipient inspect line order, timestamps and stack traces that a shortened screenshot omits.
When managed hosting helps—and what it cannot fix
Managed Rust hosting can centralize updates, backups, restarts, log access and mod installation. It may reduce permission and operating-system maintenance problems, but features and Oxide support vary by provider. Ask specifically whether you can download complete console logs, retain identity and plugin data, control update timing, run custom maps and stop automatic updates while diagnosing a modded installation.
Moving hosts does not cure an invalid map, obsolete plugin or malformed server.cfg. Reproduce the issue on a clean baseline and carry only verified data to a new environment. A host that automatically updates Rust immediately before every launch can recreate the same vanilla-versus-Oxide mismatch, so confirm how its update policy works.
Final recovery checklist
- Evidence copied before files were changed.
- Failure classified as launch, map, configuration, Oxide/plugin, runtime host or client-only.
- Updated vanilla server tested with
-logfile. - “Server startup complete” confirmed, or the exact earlier stage recorded.
server.cfgreduced and restored in controlled groups.- Custom map tested against a stock procedural map, with URL and NRE trace checked.
- Oxide version confirmed and plugins restored by batches or binary search.
- Random-crash timestamps compared with server, plugin and host events.
- Client “Steam not open?” handled separately from a host process exit.
- A complete, sanitized report prepared for the host or plugin author.
This sequence leaves you with a reproducible boundary: either the clean server itself fails, or one restored layer changes a stable boot into a crash. That boundary is the practical fix because it tells you what to repair instead of encouraging repeated reinstalls.
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