American Truck Simulator server_config.sii Reference

Complete reference for every setting in the ATS dedicated server configuration file — lobby name, players, traffic, collision, mods, and more.

All ATS dedicated server settings live in server_config.sii, using the SCS .sii format. This file is auto-generated on first server launch.

File Location

server_config.sii

server_packages.sii

server_packages.dat

Editing the Config

Stop your server
In the XGamingServer Panel, click Files
Open server_config.sii
Edit settings, save, and start your server

.sii File Format

SiiNunit
{
server_config : .unnamed {
 lobby_name: "My ATS Server"
 max_players: 8
 ...
}
}

Settings use key: value format. Strings are in double quotes. Booleans are true/false.

Server Identity

Setting	Default	Max Length	Description
`lobby_name`	`"American Truck Simulator Dedicated Server"`	63 chars	Server name in the session browser
`description`	`""`	63 chars	Server description
`welcome_message`	`""`	127 chars	Message shown when players join
`password`	`""`	63 chars	Join password (empty = public)
`server_logon_token`	`""`	—	GSLT token for persistent server ID

Players & Vehicles

Setting	Default	Description
`max_players`	`8`	Max concurrent players (hard cap: 8)
`max_vehicles_total`	`100`	Max AI vehicles across the entire server
`max_ai_vehicles_player`	`50`	Max AI vehicles visible per player
`max_ai_vehicles_player_spawn`	`50`	Max AI vehicles that can spawn near a player

Gameplay

Setting	Default	Description
`player_damage`	`true`	Players take damage from other players' collisions
`traffic`	`true`	Enable AI traffic
`force_speed_limiter`	`false`	Force the in-game speed limiter on all players
`name_tags`	`true`	Show player names above trucks
`timezones`	`0`	0 = disabled, 1 or 2 = time varies by map region

Collision & Ghosting

Setting	Default	Description
`hide_in_company`	`false`	Ghost players in company areas
`hide_colliding`	`true`	Hide colliding vehicles after teleportation
`service_no_collision`	`false`	Disable collision at gas stations and rest stops
`in_menu_ghosting`	`false`	Ghost players who are paused or in menus

Network

Setting	Default	Description
`connection_dedicated_port`	`27015`	Game port (TCP + UDP)
`query_dedicated_port`	`27016`	Query port (TCP + UDP)
`connection_virtual_port`	`100`	Steam relay virtual port (100–200)
`query_virtual_port`	`101`	Steam relay query port (100–200)

📝 Note: Virtual ports are for Steam relay and don't need port forwarding. Only the dedicated ports need forwarding.

Mods & Visibility

Setting	Default	Description
`mods_optioning`	`false`	Enforce mod requirements for joining players
`friends_only`	`false`	Not applicable for dedicated servers
`show_server`	`true`	Not applicable for dedicated servers

Moderators

 moderator_list: 2
 moderator_list[0]: 76561198001220177
 moderator_list[1]: 76561198012345678

See Moderator Setup for details.

Example Configuration

SiiNunit
{
server_config : .unnamed {
 lobby_name: "XGaming Trucking Co."
 description: "Casual trucking - all welcome!"
 welcome_message: "Welcome! Drive safe and have fun."
 password: ""
 max_players: 8
 max_vehicles_total: 100
 max_ai_vehicles_player: 50
 max_ai_vehicles_player_spawn: 50
 connection_dedicated_port: 27015
 query_dedicated_port: 27016
 server_logon_token: ""
 player_damage: false
 traffic: true
 hide_in_company: true
 hide_colliding: true
 force_speed_limiter: false
 mods_optioning: false
 service_no_collision: true
 in_menu_ghosting: true
 name_tags: true
 moderator_list: 0
}
}

American Truck Simulator server_config.sii Reference

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