# Assetto Corsa Server Troubleshooting (/docs/assetto-corsa/troubleshooting) This guide covers the most common Assetto Corsa server issues and how to fix them. The first section covers issues you'll hit with the **[Assetto Corsa Server Manager](/docs/assetto-corsa/getting-started)**; the later sections are config-level fixes for advanced users editing `server_cfg.ini` by hand. Server goes offline after starting a race [#server-goes-offline-after-starting-a-race] **Symptom:** You start a race in the manager, then the server flips to **offline** and doesn't appear in the in-game browser. **Cause:** The server can't be reached on its game ports, so the lobby drops it. This is reachability, not your race config. **Fixes:** * Check the TCP / UDP / HTTP ports in [Server Options](/docs/assetto-corsa/server-options) match the ports on your XGamingServer panel. * On a newly created server, or after changing ports, **rebuild/reinstall** once from the panel so the new port mappings apply (a plain restart isn't enough). * Keep **Register to lobby** enabled. * Full walkthrough: [Getting Into the Lobby](/docs/assetto-corsa/getting-into-lobby). *** Can't start or save a race / track shows no pit boxes [#cant-start-or-save-a-race--track-shows-no-pit-boxes] **Cause:** The track content is incomplete — it's missing its `ui/ui_track.json`, which defines pit boxes. Without it the race builder can't lay out the grid and may error. **Fixes:** * Re-download a **complete** version of the track and re-upload it on the [Tracks page](/docs/assetto-corsa/uploading-content). * For multi-layout tracks, make sure each layout folder has its own `ui_track.json`. * Stock Kunos tracks always include this — if a stock track misbehaves, restart the server so content reloads. *** Login won't stay signed in [#login-wont-stay-signed-in] **Symptom:** You log into the manager and get bounced back to the login screen. **Cause:** You're reaching the manager from a different address than the one in your URL bar, so the session cookie doesn't stick. **Fix:** Always open the manager with the full `http://YOUR_SERVER_IP:WEB_PORT` address — including the port — and log in from that same address. *** Cars or tracks not showing in the picker [#cars-or-tracks-not-showing-in-the-picker] **Fixes:** * After uploading content, **start or restart** an event — Assetto Corsa loads content at launch, so new cars/tracks appear after a restart. * If content is installed but the list looks empty or stale, restart the server so the manager re-indexes it. * Confirm you uploaded the **folder** (e.g. `my_car/`), not a zip or loose files. *** Plugin not starting [#plugin-not-starting] **Fixes:** * Confirm the plugin's files are in the right install directory. * Make sure its **UDP plugin port** isn't already in use by another plugin — run multiple plugins through a proxy. See [Plugins → UDP plugin ports](/docs/assetto-corsa/plugins). * Restart the server after enabling a plugin; plugins only load at launch. *** Required Ports [#required-ports] | Port | Protocol | Purpose | | ---- | --------- | ----------------------------------- | | 9600 | TCP + UDP | Game traffic | | 8081 | TCP + UDP | Lobby registration (server browser) | Both must be open. On XGamingServer, ports are handled automatically. *** Server Not Appearing in Browser [#server-not-appearing-in-browser] **Fixes:** * Confirm `REGISTER_TO_LOBBY=1` in `server_cfg.ini` * Ensure HTTP port (8081) is open TCP and UDP * Wait 1–2 minutes after startup for lobby registration * Try connecting via direct IP as a workaround *** "No Available Slots" When Joining [#no-available-slots-when-joining] **Cause:** `MAX_CLIENTS` is higher than the number of `[CAR_N]` entries in `entry_list.ini`, or the car model name doesn't match. **Fix:** * Count your `[CAR_N]` entries — you need at least as many as `MAX_CLIENTS` * Verify each `MODEL=` value matches an actual folder in `content/cars/` *** Custom Car Not Loading [#custom-car-not-loading] **Fixes:** * Check that the `data/data.acd` file exists inside the car folder on the server * The folder name in `content/cars/` must exactly match `MODEL=` in `entry_list.ini` and the `CARS=` line in `server_cfg.ini` *** Custom Track Not Loading / Server Crashes on Track Load [#custom-track-not-loading--server-crashes-on-track-load] **Fixes:** * Verify `data/surfaces.ini` exists in the track folder * If the track has multiple layouts, `CONFIG_TRACK` must match a valid layout subfolder name — or leave it empty for the default layout * Check capitalization — folder names are case-sensitive on Linux *** Players Get Wrong Car [#players-get-wrong-car] **Cause:** In pickup mode, players can choose any listed car. Without pickup mode, slots are assigned sequentially. **Fix:** * If you want players to choose their car: `PICKUP_MODE_ENABLED=1` * If you want assigned slots: `PICKUP_MODE_ENABLED=0` and lock specific GUIDs to `[CAR_N]` entries *** Can't Use Admin Commands [#cant-use-admin-commands] **Fixes:** * Make sure `ADMIN_PASSWORD` is set in `server_cfg.ini` * In-game, type `/admin YourPassword` in chat first * Admin access is per-session — you must re-authenticate after every reconnect *** Server Closes After Race Ends [#server-closes-after-race-ends] **Cause:** `LOOP_MODE=0` (default behavior). **Fix:** Set `LOOP_MODE=1` in `[SERVER]` to restart sessions automatically after the race. *** Players Disconnecting with High Ping [#players-disconnecting-with-high-ping] **Fix:** Add a ping limit to `[SERVER]` in `server_cfg.ini`: ```ini MAX_CONTACTS_PER_KM=10 ``` Or limit ping in the Assetto Corsa server lobby settings. *** Mod Content Mismatch [#mod-content-mismatch] **Cause:** Players don't have the same custom content installed. **Fix:** All players must have the exact same custom cars and tracks installed locally. Share download links with your community. [Content Manager](https://assettocorsa.club/content-manager.html) can help players manage content. *** > 💡 **Still stuck?** Join our [Discord](https://discord.xgamingserver.com) for support. Related Guides [#related-guides] * [Configure Your Server](/docs/assetto-corsa/configure-your-server) * [Install Custom Cars & Tracks](/docs/assetto-corsa/install-mods) * [Admin Commands](/docs/assetto-corsa/admin-commands)