Take a look here for information of how to setup a server.
https://steamcommunity.com/sharedfiles/filedetails/?id=454529617
Below is an example server configuration file. This file may change as ARK updates. (ShooterGame\Saved\Config\WindowsServer\GameUserSettings.ini)
[ServerSettings]
RCONPort=23538
KickIdlePlayersPeriod=2400.000000
AutoSavePeriodMinutes=15.000000
RCONEnabled=True
ServerAdminPassword=adminpassword
ServerPassword=playerjoinpassword
DayCycleSpeedScale=1.011653
DayTimeSpeedScale=0.555122
NightTimeSpeedScale=1.924716
XPMultiplier=2.321700
TamingSpeedMultiplier=3.000000
HarvestAmountMultiplier=2.568625
[/Script/ShooterGame.ShooterGameUserSettings]
MasterAudioVolume=1.000000
MusicAudioVolume=1.000000
SFXAudioVolume=1.000000
VoiceAudioVolume=1.000000
CameraShakeScale=1.000000
bFirstPersonRiding=False
bThirdPersonPlayer=False
bShowStatusNotificationMessages=True
TrueSkyQuality=0.270000
FOVMultiplier=1.000000
GroundClutterDensity=1.000000
bFilmGrain=False
bMotionBlur=True
bUseDFAO=True
bUseSSAO=True
bShowChatBox=True
bCameraViewBob=True
bInvertLookY=False
bFloatingNames=True
bChatBubbles=True
bHideServerInfo=False
bJoinNotifications=False
bCraftablesShowAllItems=True
LookLeftRightSensitivity=1.000000
LookUpDownSensitivity=1.000000
GraphicsQuality=2
ActiveLingeringWorldTiles=10
LastServerSearchType=0
LastServerSearchHideFull=False
LastServerSearchProtected=False
HideItemTextOverlay=False
bDistanceFieldShadowing=True
LODScalar=1.000000
HighQualityMaterials=True
HighQualitySurfaces=True
bTemperatureF=False
bDisableTorporEffect=False
EmoteKeyBind1=0
EmoteKeyBind2=0
bUseVSync=False
ResolutionSizeX=1280
ResolutionSizeY=720
LastUserConfirmedResolutionSizeX=1280
LastUserConfirmedResolutionSizeY=720
WindowPosX=-1
WindowPosY=-1
bUseDesktopResolutionForFullscreen=False
FullscreenMode=2
LastConfirmedFullscreenMode=2
Version=5
[ScalabilityGroups]
sg.ResolutionQuality=100
sg.ViewDistanceQuality=3
sg.AntiAliasingQuality=3
sg.ShadowQuality=3
sg.PostProcessQuality=3
sg.TextureQuality=3
sg.EffectsQuality=3
sg.TrueSkyQuality=3
sg.GroundClutterQuality=3
sg.IBLQuality=1
sg.HeightFieldShadowQuality=3
[SessionSettings]
SessionName=[AU] ClanHost.com.au Servers
[/Script/Engine.GameSession]
MaxPlayers=60
