How do I fix the "Server Port Not Open" error in Valheim?

The ''Server Port Not Open'' error in Valheim is a common issue that occurs when players attempt to host or join a multiplayer game. This error typically arises because the game''s default port (2456-2458) is not properly forwarded or opened on the host''s router or firewall. Valheim uses these ports to establish connections between players, and if they are blocked, the server cannot communicate with other players.\n\nTo fix this issue, you need to ensure that the necessary ports are open on your router and firewall. First, log into your router''s admin panel. This is usually done by entering the router''s IP address (commonly 192.168.1.1 or 192.168.0.1) into your web browser. Once logged in, navigate to the port forwarding section. Here, you will need to create a new rule to forward ports 2456-2458 to the local IP address of the device hosting the Valheim server.\n\nIf you are unsure of your device''s local IP address, you can find it by opening the Command Prompt on Windows (type ''cmd'' in the Start menu) and entering ''ipconfig''. Look for the ''IPv4 Address'' under your active network connection. On Mac or Linux, you can use the Terminal and type ''ifconfig'' to find the IP address. Once you have this information, enter it into the port forwarding rule on your router.\n\nNext, ensure that your firewall is not blocking Valheim. On Windows, open the Windows Defender Firewall settings and create an inbound rule to allow Valheim through. You can do this by selecting ''Allow an app through firewall'' and adding Valheim to the list. Make sure to check both private and public network options. If you are using a third-party antivirus or firewall, consult its documentation to allow Valheim through.\n\nIf you are still encountering issues, double-check that your game and Steam are up to date. Outdated versions can sometimes cause connectivity problems. Additionally, ensure that all players attempting to join the server are using the same version of the game. Mismatched versions can lead to connection errors.\n\nFor players hosting a dedicated server, the process is slightly different. You will need to configure the server''s settings file (usually named ''start_headless_server.bat'') to specify the correct IP address and ports. Open this file with a text editor and ensure the ''port'' and ''ip'' settings are correctly configured. Save the file and restart the server to apply the changes.\n\nFinally, if you are using a VPN, try disabling it temporarily. VPNs can sometimes interfere with port forwarding and server connections. Once the server is running smoothly, you can re-enable the VPN if needed.\n\nIn summary, fixing the ''Server Port Not Open'' error involves ensuring that ports 2456-2458 are properly forwarded on your router, configuring your firewall to allow Valheim, and verifying that all software is up to date. By following these steps, you should be able to resolve the issue and enjoy seamless multiplayer gameplay in Valheim.