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The most common issues with your Wurm Unlimited server on a VPS and how to fix them quickly, from crashes to lag → Learn more
Running your own Wurm Unlimited server on a VPS is a lot of fun, but it also means taking responsibility when something goes wrong. Crashes, lag, and configuration issues are common challenges that every server owner encounters sooner or later.
To help you spend less time troubleshooting, we’ll show you the most common issues and how to fix them quickly on your VPS.
FAQ
C:\ZapX-GameServers\wurm-unlimited\logs\server.log. Restarts after crashes are logged in logs\supervisor.log.Wurm Unlimited (wurm-unlimited) - Start shortcut.Wurm Unlimited (wurm-unlimited) - Stop shortcut. It closes the databases and writes the maps to disk, which takes about eight seconds.Wurm Unlimited (wurm-unlimited) - Backup shortcut on your VPS. Your entire VPS is also backed up daily. With an active ZapX Pass, you can restore these backups yourself.Feedback
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The causes of server issues are often not immediately obvious. The best place to start is the server output: if you set up Wurm Unlimited using the Game Server Installer, you can find it at C:\ZapX-GameServers\wurm-unlimited\logs\server.log. The installer logs restarts after crashes in logs\supervisor.log.
If your server doesn’t appear in the server list, first check whether it’s running and has finished starting up. Check server.log to confirm. Then check that the ports are open in the Windows firewall and your VPS’s network firewall. You can find out which ports Wurm Unlimited needs in Wurm Unlimited: Set up a server on your VPS. Also make sure there are no active filters in the server list hiding your server.
Start the server via Remote Desktop using the Wurm Unlimited (wurm-unlimited) - Start shortcut and watch server.log. Common causes include a port already in use by another program or not enough memory for Java. If you recently changed anything on the server, try reverting the change.
Nothing ends a good session faster than an unexpected crash. Causes can include an outdated server version, an overloaded VPS, or a misconfiguration. The installer automatically restarts your server after a crash. If it crashes several times in quick succession, the installer gives up. You’ll then need to fix the cause and restart the server yourself.
An outdated server can cause crashes, unexpected behavior, or startup issues, and often prevents players from connecting with a newer game version. Updates aren’t installed automatically. Open the Game Server Installer again and select Wurm Unlimited. It will then show Update. Alternatively, use the Wurm Unlimited (wurm-unlimited) - Update shortcut on your VPS.
Always stop the server using the Wurm Unlimited (wurm-unlimited) - Stop shortcut. It uses the server’s shutdown hook to stop it, close the databases, and write the maps to disk. This takes about eight seconds. If you terminate the process forcefully, for example through Task Manager, you may lose progress. If you use community server mods, try disabling them after a game update if the server crashes afterward.
Issues such as lag or delays often occur when the configuration isn’t right or the VPS doesn’t have enough resources.
Inappropriate settings can lead to higher resource usage and lag. The server gets its name, player slots, game mode, and ports from the installer’s startup command each time it starts. If you experience lag, first reduce the number of player slots by running the installer again with a lower value. You can set how much memory Java is allowed to use under Memory (GB).
Wurm Unlimited needs at least 4 GB of memory. The operating system and other programs on the VPS also need resources. You can check how heavily your VPS is being used in the ZapX dashboard under Monitoring. If memory or CPU usage is consistently maxed out, upgrading your VPS can help. Learn more in Upgrade, downgrade, renewal, and cancellation.
Ping spikes and lag are usually caused by limited resources on the VPS, a high number of players, or a server location far from your players. First, check resource usage under Monitoring. If you suspect routing issues, see Diagnose network issues with WinMTR/MTR. If you still need help, contact our support team.
Game servers are occasionally targeted by DDoS attacks that flood the server with traffic. Your VPS is protected by our DDoS protection. You can view past attacks in the DDoS Manager for your VPS in the ZapX dashboard, if it’s available at your location. If you suspect an attack is causing issues, contact our support team.
Regular backups can save you a lot of stress. Use the Wurm Unlimited (wurm-unlimited) - Backup shortcut to back up your world as a ZIP file at any time, and the Wurm Unlimited (wurm-unlimited) - Restore shortcut to restore it. Your entire VPS is also backed up automatically every day. With an active ZapX Pass, you can restore these backups yourself and create your own. Learn more in Daily backups, restoration, and restricted actions.
These steps should help you solve your issue. If they don’t, don’t hesitate to contact our support team: simply start a Support Chat in your ZapX customer account. We’re here every day and happy to help! 🙂
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