🎮 Game Error Codes What it means & how to fix it

Conan Exiles Can't Connect to Server? Here's the Fix

When you can't connect to a Conan Exiles dedicated server, it's almost always ports: the server listens on UDP 7777 (game), 7778 (raw) and 27015 (query), and all three must be forwarded. If you host on the same PC you play on, you must change these so the client and server don't fight over 7777.

Exact details for Conan Exiles

Error codes

Server not showing in server browser Steam/EOS can't reach the query port

Cause: Query port 27015/UDP not forwarded or blocked by firewall.

Fix:
  1. Forward UDP 27015 (Query) and UDP 7777 (Game) to the server's local IP in your router.
  2. Add a firewall exception for the ConanSandboxServer executable — Windows firewall blocks it silently by default.
  3. Wait 2-3 minutes after boot; the server registers with the master list on a delay.
  4. Confirm your public IP matches your router's WAN IP; if they differ you're behind CGNAT and no forward will work.
Can't join / connection timeout Client reaches the query port but not the game port

Cause: UDP 7777 (and 7778 raw) not open.

Fix:
  1. Forward UDP 7777 AND 7778 in addition to 27015 — the raw UDP port is required, not optional.
  2. Have joiners use Direct Connect with the public IP and game port rather than the browser.
  3. Verify the ConanSandbox client and server are on the same build/patch.
Port conflict when hosting on your gaming PC Client and server both grab 7777

Cause: Default ports collide on one machine.

Fix:
  1. Change the server to 7779/7780/27016 (Port, RawUDPPort, QueryPort) and forward those instead.
  2. For multiple servers on one box, skip N+1 ports per instance (the server reserves the next port).

Fixes that work for most Conan Exiles errors

  1. Forward UDP 7777, 7778 and 27015 to the server's LAN IP.
  2. Add a firewall rule for ConanSandboxServer.exe (both directions).
  3. If hosting on your play PC, move the server to 7779/7780/27016.
  4. Check for CGNAT: public IP must equal router WAN IP.
  5. Match client and server build numbers.
  6. Give the master list 2-3 minutes to show the server.

FAQ

What ports does a Conan Exiles server use?

By default UDP 7777 (Game), 7778 (RawUDP) and 27015 (Query). All three must be forwarded and allowed through the firewall for players to see and join the server.

Why won't my Conan Exiles server show in the browser?

The query port (UDP 27015) is not reachable — either it isn't forwarded or the ConanSandboxServer executable is blocked by the firewall. Fix both and wait a couple of minutes for the master list to update.

Can I host and play Conan Exiles on the same PC?

Yes, but you must change the server ports off the defaults (e.g. 7779/7780/27016) so the client and server don't both try to bind 7777, then forward the new ports.

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