The fastest reliable fix is to treat Error querying server mods as a diagnostic symptom, not as one specific fault. Start the dedicated server with the entire mod argument removed. If the unmodded server starts, verify every ID is an ARK: Survival Ascended CurseForge project ID, use the current -mods=123456,789012 syntax, then add one known-good mod at a time. For serverUnreachable, investigate the host’s outbound DNS, HTTPS, TLS certificate, firewall and proxy path; for HTTP 400 or 404, correct the command or remove the unavailable mod. A player-facing port-forwarding change usually cannot repair an outbound mod-service request.
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What the error means
ARK: Survival Ascended (ASA) dedicated servers obtain mods from CurseForge when they start. The server requests the projects listed in its launch arguments, downloads or updates them, and loads the resulting local mod library. The official ASA configuration uses the -mods launch argument with CurseForge Mod Project IDs:
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-mods=<ModId1>[,<ModId2>[...] ]For example:
-mods=123456,789012IDs are comma-separated with no requirement to add spaces. Mods listed this way are checked and updated when the server starts.
serverUnreachable means the query or service connection failed. It does not by itself prove that the game server’s listening port is closed, that a particular mod is broken, or that the save is damaged. A local failure can occur at the same time: logs may show both Couldn't load mods library from disk and Error querying server mods: APIError: Failed (serverUnreachable). Capture the complete line, including the HTTP status and mod ID or name, before changing files.
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Identify the exact failure branch
| Console symptom | Most useful interpretation | First action |
|---|---|---|
serverUnreachable |
The host could not complete the external mod-service request. DNS, outbound HTTPS, TLS certificates, firewall or proxy policy, and temporary service availability are possible causes. | Test outbound name resolution and HTTPS from the server host, then inspect certificate, firewall and proxy logs. |
| HTTP 404 after the mod query | CurseForge did not provide one of the requested projects. The ID may be wrong, unavailable for ASA, removed, or entered from an older game’s catalog. | Remove the newest IDs, confirm each project exists for ASA, and retry with one verified project. |
| HTTP 400 | The request or startup configuration is malformed. Incorrect IDs, separators, or unrelated launch syntax can trigger it. | Reduce the command to the documented ASA form and add options back incrementally. |
Couldn't load mods library from disk |
The local mod-data directory could not be read or contains an incomplete or corrupt download. It can accompany a network error. | Check permissions, free space and the failed download while preserving logs and a backup. |
The server closes only when -mods is present |
The base map process works; the failure is in retrieval, IDs, local mod data, resource limits or another mod-related setting. | Run the server without mods, then reintroduce one known-good project. |
Use this safe troubleshooting sequence
- Back up before cleanup. Copy the world save, configuration files and recent console logs. Do not delete a mod directory until you know which files are disposable and have a recovery copy.
- Prove the base server starts. Remove the complete mod argument, not just one ID, and launch once. A successful unmodded start isolates the basic map process from mod retrieval and loading.
- Record the complete error. Write down the exact status (
serverUnreachable, 400 or 404), the mod ID or displayed name, and the point at which the process exits. Truncated panel messages often hide the actionable detail. - Check every project at its source. Use the ASA CurseForge project ID. Do not substitute an ARK: Survival Evolved Steam Workshop ID, an item number copied from an old configuration, or a display name.
- Correct the launch syntax. Use a single
-modsargument with comma-separated IDs, such as-mods=123456,789012. Keep the argument on the server’s launch command or the host panel’s dedicated mod field, according to that panel’s documented format. - Retry with one known-good mod. Remove unrelated launch options temporarily and start with one verified ASA project. This makes a malformed option or a single unavailable project easier to distinguish from a host-wide connection problem.
- Reintroduce mods incrementally. Add the remaining IDs in small groups or one at a time, restarting after each change. When the error returns, the last addition is the leading suspect.
- Check host resources. Watch free disk space, memory and startup duration. Each mod adds download, loading and runtime demand; a large stack can exceed a server plan even when the command is valid.
- Restart after every list change. Mod-list edits are applied at startup. Leaving the process running will not load a newly edited list.
Verify IDs and the ASA launch command
Use CurseForge project IDs, not legacy Workshop identifiers
ASA and ARK: Survival Evolved do not use the same mod distribution path. ASA requests CurseForge projects. A number copied from an ASE Steam Workshop page can look plausible while returning a failed request or a missing project. Open the ASA project listing, locate its numeric project ID, and compare it character by character with the value in the server command.
Do not rely on a mod’s title alone. Names can change, duplicate one another, or include punctuation that is not valid in a numeric ID. If a hosting panel displays both a name and an ID, use the ID shown for the ASA installation and retain the name in your notes for later isolation.
Keep the argument unambiguous
A minimal command should look like this:
-mods=123456Multiple projects use commas:
-mods=123456,789012,345678Do not use semicolons, spaces as separators, a second competing -mods argument, or an ASE-era parameter in place of this form. If the host panel has a separate mod-list field, enter IDs there exactly as the panel expects rather than pasting a second command fragment into the map or executable field.
Reduce the command while testing
Temporarily remove optional launch switches that are unrelated to the map and mods. A 400 response can be caused by a malformed request, but a crowded command line makes it difficult to determine whether the parser or a project ID is at fault. Once one mod starts successfully, restore other options one at a time and keep the working command as a rollback copy.
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Isolate a missing or incompatible mod
When the response is HTTP 404
A 404 indicates that CurseForge did not provide one of the requested projects. The project may have been removed, may not be an ASA project, or may be represented by a different ID than the one entered. Remove the IDs added most recently and start with the last known-good list. Then add each suspect project separately. If the server starts until one ID is present, leave that project out and check its ASA listing or maintainer status before trying again.
When only a larger stack fails
A stack can fail even though every individual project works alone. Test in groups to find an interaction or resource threshold, then reduce the list to the smallest set that reproduces the problem. Keep a dated text copy of each working list so you can roll back without guessing which changes were made.
When the newest mod is not actually the cause
Startup order and download timing can expose an existing local-library or network problem when a new ID is added. If removing the newest entry does not restore startup, test the previously working IDs one at a time. The goal is to identify the first request that fails, not to assume that chronology proves causation.
Fix serverUnreachable on the server host
This variant concerns the server’s outbound dependency. Check these items from the machine or container that runs ASA, not only from the computer used to join the game:
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- DNS: Confirm the host can resolve the external mod service and that the configured resolver is responding. A player’s local DNS result does not prove the dedicated host can resolve the same name.
- Outbound HTTPS: Verify that outbound TCP 443 is permitted by the host firewall, data-center policy, security group or container network. The server must be able to initiate the request.
- TLS and certificates: Check the host clock, certificate store and TLS interception rules. An expired or untrusted certificate can present as a connection failure even when general web browsing works.
- Proxy configuration: If the environment requires an HTTP or HTTPS proxy, confirm that the server process is configured to use it and that the proxy permits the destination. If no proxy is intended, remove stale proxy variables that redirect requests to an unreachable endpoint.
- Firewall and egress policy: Review denied outbound connections in host, operating-system and provider logs. Allowing inbound player traffic does not automatically allow egress to CurseForge.
- Service availability: Retry after recording the timestamp. A temporary external service interruption can produce the same status as a local fault; repeated failures from several clean attempts point more strongly to host configuration.
Do not begin with game-port forwarding. Port forwarding determines whether players can reach your ASA server; it does not grant that server permission to make an outbound mod query.
Community reports associate this message with certificate and connection symptoms, but no single network change is universal. Make one controlled change at a time and retain the original logs so a successful retry can be explained and reproduced.
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Fix HTTP 400 errors
- Remove all but one verified ASA CurseForge ID.
- Rewrite the argument in the documented comma-separated form, for example
-mods=123456. - Remove duplicate
-modsarguments, stray punctuation and copied ASE parameters. - Start the server and inspect the complete request error.
- Add the remaining IDs and optional launch settings back one at a time.
A recorded 400 failure stopped after the IDs and command configuration were corrected. That pattern makes syntax and identifier validation the appropriate first response; replacing files or changing player networking is not.
Repair a local mod-library load failure carefully
If the console says Couldn't load mods library from disk, inspect the server’s mod-data location and its surrounding conditions:
- Confirm the account running the dedicated server can read and write the mod-data directory.
- Check free space on the volume that stores downloads and temporary files.
- Look for a partial download left by an interrupted update and compare its timestamp with the failed startup.
- Check whether antivirus, endpoint protection or a read-only mount blocked a file operation.
- Preserve the console log and configuration before removing anything.
The available error evidence does not establish one universal directory path or a guaranteed deletion procedure. Do not apply a blanket “delete the mods folder” fix: it can remove useful cached data, force a large redownload, or destroy the evidence needed to identify a permissions problem. After a backup, remove only the clearly incomplete data using the controls supplied by your host or installation, then restart and observe the download and load sequence.
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ActiveMods is a comma-separated setting documented for controlling mod activation and order, but older instructions around it target Steam Workshop-based ARK: Survival Evolved setups. ASA’s current dedicated-server method is the CurseForge ID list passed through -mods.
Do not blindly combine ActiveMods, -automanagedmods, old GameModIds entries and Steam Workshop IDs with an ASA launch line. Conflicting legacy values can make it unclear which list the server is attempting to use. Remove obsolete entries while testing and follow the syntax supported by the current ASA server build or your host panel. If a panel generates its own configuration, let it be the single source of truth instead of maintaining a second hand-edited list.
Account for memory, storage and startup time
Every additional mod increases the amount of data that must be downloaded, indexed and loaded. Large stacks can lengthen startup and consume enough memory to exceed the host’s allocation. A server that appears to “close” may be terminating after a resource failure rather than after a bad ID.
- Record baseline startup time with no mods.
- Measure memory and disk use after adding a known-good project.
- Repeat after each group of additions and watch for a sharp increase.
- Leave headroom for the map, players, save operations and operating system.
- Reduce the list or increase the allocation when the server consistently reaches its memory or storage limit.
Do not interpret a successful download as proof that the server has enough runtime memory. Retrieval and gameplay loading are separate stages.
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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 problemsSelf-hosting and managed hosting: the controls that matter
Either model can run ASA mods. The practical difference is who can inspect and change the conditions that produce the error.
| Control | Self-hosted server | Managed host |
|---|---|---|
| Outbound DNS, HTTPS and TLS | You control resolver, certificate store, firewall, proxy and egress policy. | The provider controls much of the network path; support must verify egress and certificate issues. |
| Console and mod IDs | Full process logs and command-line visibility are normally available. | Quality depends on whether the panel exposes complete console lines, IDs and exit reasons. |
| Automatic startup updates | The ASA launch process can request updates at every start. | The same behavior depends on the panel preserving the documented -mods argument. |
| Memory and storage headroom | You choose hardware and can expand it, subject to your operating environment. | The plan’s allocation limits mod count, cache size and startup headroom. |
| Backups and rollback | You must schedule, verify and retain backups yourself. | Check whether the panel offers restorable save and configuration snapshots. |
| Unavailable-mod support | You isolate and remove the project directly. | You need a support path that can identify the failed project and restart after changes. |
Choose the arrangement that gives you complete logs, control of outbound connectivity, enough memory and storage, and a dependable rollback process. No hosting model removes the need to use valid ASA CurseForge IDs.
Prevent the next startup failure
- Keep a plain-text copy of the last known-good launch command and mod list.
- Record each project’s ASA ID beside its human-readable name and the date it was added.
- Change one variable at a time: ID, launch option, network rule or local cache.
- Restart after every mod-list edit and save the resulting console output.
- Back up the save and configuration before upgrades or cache cleanup.
- Monitor disk space, memory and startup duration as the stack grows.
- When an error returns, capture the exact status and project ID before attempting a fix.
The reliable decision path is therefore: establish a clean unmodded start, validate ASA CurseForge identifiers and syntax, isolate the first failing project, then investigate outbound connectivity or local resources according to the status shown in the log.
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