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Launch Parameters

These parameters are passed on the command line when starting your game or server (e.g. MyGameServer.exe -log -Port=7777).

-Port=7777​

  • Custom listen port for Dedicated Servers (overrides [URL] Port in DefaultEngine.ini)

-QueryPort=27015​

  • Custom query port for Dedicated Servers (overrides GameServerQueryPort in DefaultEngine.ini)

-SteamServerName=CustomServerName​

  • Custom server name for dedicated servers (truncated to Steam's maximum server name length)

-MULTIHOME=1.2.3.4​

  • Binds the dedicated server to a specific local IP address, useful on machines with multiple network interfaces

-SteamCoreSocketsRelays=true​

  • Overrides bAllowP2PPacketRelay from DefaultEngine.ini (true = use the Steam relay network, false = connect via IP)

-force_steamclient_link​

  • Windows dedicated servers only: forces loading of the Steam client libraries (steamclient64.dll, tier0_s64.dll, vstdlib_s64.dll) at startup

-NoPacketHandler​

  • Non-Shipping builds only: disables packet handlers on the SteamCoreSockets NetDriver, which also disables the SteamCore Auth Module. Only use this for debugging.