Icarus Server Launch Parameters Reference
Complete command-line / startup parameter reference for the Icarus dedicated server, including ports, multihome, save dir suffix, and prospect loading.
Most Icarus settings live in ServerSettings.ini, but a small set of options can only be set as command-line parameters at server launch. These go in Startup → startup command in the XGamingServer Panel.
Where to Edit
In the XGamingServer Panel, click your Icarus server and open the Startup tab.
Find the startup command field (or individual parameter variables). Parameters are space-separated and prefixed with -.
Click Save and restart from Console.
Network Parameters
| Parameter | Example | Description |
|---|---|---|
-PORT= | -PORT=17777 | Game port. Default 17777, UDP. |
-QueryPort= | -QueryPort=27015 | Steam query port. Default 27015, UDP. |
-MULTIHOME= | -MULTIHOME=0.0.0.0 | Bind the server to a specific IP. Useful when the host has multiple NICs. |
Identity & Display
| Parameter | Example | Description |
|---|---|---|
-SteamServerName= | -SteamServerName="My Icarus Server" | Server browser display name. 64 character maximum. Use this instead of SessionName= in the INI — SessionName is currently broken. |
Save Directory Control
| Parameter | Example | Description |
|---|---|---|
-UserDir= | -UserDir=/data/icarus | Custom base directory for server data (configs, prospects, logs) |
-saveddirsuffix= | -saveddirsuffix=instance2 | Append a suffix to the Saved folder (e.g. Saved-instance2). Required for running multiple Icarus servers on the same host. |
Prospect Loading
| Parameter | Example | Description |
|---|---|---|
-ResumeProspect | -ResumeProspect | Resume the last active prospect on startup |
-LoadProspect= | -LoadProspect=MyOpenWorld | Load a specific saved prospect by name |
-CreateProspect= | -CreateProspect="OpenWorld_Styx 1 false MyOpenWorld" | Create a new prospect on startup. Format: [Type] [Difficulty 1-4] [Hardcore true/false] [SaveName]. Remove this after first boot or it will create a fresh save every restart. |
See Prospect Management for the full prospect workflow.
Logging
| Parameter | Example | Description |
|---|---|---|
-log | -log | Show the server log in the console window |
-LOG= | -LOG=server.log | Write logs to a specific filename inside the Saved folder |
-ABSLOG= | -ABSLOG=/var/log/icarus.log | Write logs to an absolute filesystem path |
Example Startup Commands
Basic always-on Open World
IcarusServer.exe -log -SteamServerName="My Open World" -PORT=17777 -QueryPort=27015 -ResumeProspectMulti-instance host (second server)
IcarusServer.exe -log -SteamServerName="Icarus #2" -PORT=17779 -QueryPort=27017 -saveddirsuffix=instance2 -ResumeProspectThe -saveddirsuffix=instance2 keeps Saved-instance2/ separate from the first instance's Saved/, so prospects, configs, and logs don't collide.
First-time prospect creation
IcarusServer.exe -log -SteamServerName="Olympus Outpost" -CreateProspect="Olympus 2 false OlympusBase"After first boot, edit ServerSettings.ini to set ResumeProspect=true and remove -CreateProspect from the startup command.
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