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Sunkenland Server Not Showing - Sunkenland Wiki

Sunkenland Guide • Updated Jan 16, 2026

Sunkenland Server Not Showing in Browser

If players cannot find your Sunkenland server, it may be due to port forwarding issues, the known server browser bug, or server visibility timeout.

Known Issue: Sunkenland's server browser only displays ~20% of online servers due to a bug. Use Direct Connect with your server's IP and port to join reliably.

Quick Diagnostic Table

Check Why It Fails Fix
Game Port 27015 UDP Port blocked by firewall or router Forward UDP 27015 to the server IP
Query Port (27016 or custom) Server browser cannot query Forward the query port for listing
Server browser bug Only ~20% of servers appear in list Use Direct Connect instead
Server visibility timeout Server drops from list after ~24h Restart the server daily
Dedicated Servers tab Wrong tab selected in browser Click "Dedicated Servers" at top left

Step-by-Step Fix

  1. Use Direct Connect first. Don't rely on the server browser - use the direct connect option with IP:27015 (or your custom port).
  2. Check the correct browser tab. In-game, click "Dedicated Servers" at the top left. By default it shows local hosted servers by other players.
  3. Forward ports. Open UDP 27015 (game) and your query port on your router and Windows Firewall.
  4. Use startup parameters. Launch with: Sunkenland-DedicatedServer -nographics -batchmode -worldGuid "YOUR-GUID" -port 27015 -queryport 27016
  5. Restart server daily. Known bug causes servers to drop from the list after ~24 hours of uptime.

Direct Connect Method

Recommended: Due to the server browser displaying only ~20% of servers, always share your IP address with friends for direct connection.

  1. Get your public IP from whatismyip.com
  2. Share YOUR_IP:27015 with friends (replace 27015 if using custom port)
  3. In-game, use the Direct Connect option to join

Startup Command Example

Sunkenland-DedicatedServer.exe -nographics -batchmode -worldGuid "abc123-def456" -region "us" -maxPlayerCapacity "8" -port 27015 -queryport 27016

Firewall Configuration

# Windows PowerShell (Run as Administrator)
New-NetFirewallRule -DisplayName "Sunkenland Game" -Direction Inbound -LocalPort 27015 -Protocol UDP -Action Allow
New-NetFirewallRule -DisplayName "Sunkenland Query" -Direction Inbound -LocalPort 27016 -Protocol UDP -Action Allow

# Linux (UFW)
sudo ufw allow 27015/udp comment "Sunkenland Game Port"
sudo ufw allow 27016/udp comment "Sunkenland Query Port"
sudo ufw reload

Server Dropping from List

Known Bug: Dedicated servers often become invisible in the server browser after running for ~24 hours, even though they're still online. The game ID/direct connect stops working too.

Workaround: Schedule daily server restarts. Set up a cron job or Windows Task Scheduler to restart the server every 12-24 hours.

Steam Session Issues

If players see "SessionInfo: IsValid=True" in logs but can't connect:

  1. Re-run SteamCMD: steamcmd +login anonymous +app_update 2667530 validate +quit
  2. This downloads additional files needed after the first run
  3. Restart the server after the update completes

Tip: If the server shows locally but not for friends, the issue is almost always port forwarding or the server browser bug. Direct connect bypasses both issues.

Keep your waterworld online. Host your Sunkenland server with Supercraft for managed ports and automatic updates.

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