Valheim

Valheim uses a multi-port UDP layout. Swarm Hosts reserves the base game port and the next port together for normal play, and also reserves base+2 so crossplay can be enabled without changing the deployment shape later.

Basics you should know

  • Default protocol: UDP
  • Typical ports: base port, base+1, and optional crossplay base+2
  • Persistent data: /config
  • World saves: /config/worlds_local

Tip

Set a password with at least 5 characters or the dedicated server will refuse to start.

1) Open Launch. 2) Choose Valheim. 3) Set Server name, World name, and Server password. 4) Leave Crossplay disabled unless you need non-Steam clients. 5) Click Launch.

Ports

  • Game port: auto-assigned UDP base port
  • Companion server port: auto-assigned UDP base+1
  • Crossplay backend port: reserved as UDP base+2

Note

Swarm Hosts assigns all three ports together. Share the base UDP port with players for direct join.

Data you may want to manage

  • Worlds: /config/worlds_local
  • Admin list: /config/adminlist.txt
  • Ban list: /config/bannedlist.txt
  • Permitted list: /config/permittedlist.txt

Player connection info

Players can join through Valheim's Join IP flow using:

<HOST_PUBLIC_IP>:<BASE_PORT>

Source and provenance

Swarm Hosts installs the Valheim dedicated server from Steam. The server binaries come from Valve's Steam distribution path for Valheim dedicated servers, while Swarm Hosts handles the setup, launch settings, port assignment, and persistent storage for you.