How do I resolve the "Connection Lost" error when playing Valheim with friends?

The ''Connection Lost'' error in Valheim multiplayer can be frustrating, but it is often caused by common issues that can be resolved with a few troubleshooting steps. Valheim''s multiplayer mode relies on a peer-to-peer connection, meaning one player hosts the game while others join. If the host''s internet connection is unstable or the game files are corrupted, players may experience disconnections. Below, we’ll explore the causes and solutions to this problem.\n\nFirst, ensure that the host has a stable internet connection. A weak or fluctuating connection can cause players to lose connection to the server. The host should test their internet speed using an online tool and ensure they have sufficient upload and download speeds. If the host is using Wi-Fi, switching to a wired Ethernet connection can significantly improve stability. Additionally, the host should close any bandwidth-heavy applications, such as streaming services or downloads, to prioritize Valheim’s connection.\n\nNext, verify that all players are using the same game version. Valheim frequently receives updates, and if the host and players are on different versions, the game may fail to connect. To check the version, open the Steam client, navigate to the Library, and right-click Valheim. Select ''Properties'' and then ''Updates'' to ensure automatic updates are enabled. If updates are pending, restart Steam to apply them. All players should do this before attempting to reconnect.\n\nIf the issue persists, the host should check their firewall and port settings. Valheim requires specific ports to be open for multiplayer connections. The default ports are 2456-2458 for both TCP and UDP. The host can open these ports by accessing their router’s settings and forwarding the ports to their device. Detailed instructions for port forwarding can be found on the router manufacturer’s website. Additionally, the host should ensure that Valheim is allowed through their firewall by adding it to the list of exceptions in their antivirus or firewall software.\n\nAnother common cause of the ''Connection Lost'' error is corrupted game files. Both the host and players should verify the integrity of their game files through Steam. To do this, right-click Valheim in the Steam Library, select ''Properties,'' then ''Local Files,'' and click ''Verify Integrity of Game Files.'' This process will scan for missing or corrupted files and replace them. After verification, restart the game and attempt to reconnect.\n\nIf the problem continues, consider using a dedicated server instead of peer-to-peer hosting. Dedicated servers provide a more stable connection and reduce the likelihood of disconnections. You can set up a dedicated server using Valheim’s dedicated server tool, which is available in the Steam Tools library. Alternatively, you can rent a server from a third-party provider. Dedicated servers require more setup but offer better performance for larger groups.\n\nFinally, if none of the above solutions work, try restarting your devices and routers. Sometimes, a simple reboot can resolve connectivity issues. Additionally, ensure that all players are geographically close to the host, as long distances can increase latency and cause disconnections. If you’re playing with friends across the globe, consider using a VPN to optimize the connection.\n\nIn summary, the ''Connection Lost'' error in Valheim multiplayer is often caused by unstable connections, version mismatches, or corrupted files. By ensuring a stable internet connection, verifying game versions, opening the correct ports, and using a dedicated server, you can minimize disconnections and enjoy a smoother multiplayer experience. For new players, these steps may seem daunting, but they are essential for maintaining a stable connection in Valheim’s challenging world.