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

Rainbow Six Siege Error Codes

Rainbow Six Siege errors are mostly Ubisoft server/connection problems plus a few PC crashes. Here's what each common code means and how to fix it.

Error codes

2-0x0000C015 Lost connection to the Ubisoft/game servers

Cause: A server-side disconnect or maintenance, sometimes a local network drop.

Fix:
  1. Check the Rainbow Six/Ubisoft server status.
  2. Restart the game and Ubisoft Connect.
  3. Restart your router; use a wired connection.
3-0x0001000B Connection to the Ubisoft servers failed

Cause: A network or NAT problem reaching Ubisoft's services.

Fix:
  1. Set your NAT type to Open (UPnP or port-forward Siege's ports).
  2. Restart the router and disable VPN.
  3. Allow the game and Ubisoft Connect through the firewall.
8-0x00003700 General connection/server error

Cause: A temporary Ubisoft service issue or a connection interruption.

Fix:
  1. Wait and retry — often server-side.
  2. Restart Ubisoft Connect and the game.
  3. Verify game files.
4-0x00000001 Disconnected / connection lost

Cause: Your session dropped, usually network instability or a server hiccup.

Fix:
  1. Use a wired Ethernet connection.
  2. Restart the router and flush DNS.
  3. Retry after a minute.
6-0x00001000 Update/version mismatch or connection error

Cause: An out-of-date client or a connection problem during matchmaking.

Fix:
  1. Update the game fully in Ubisoft Connect/Steam.
  2. Verify game files.
  3. Restart the launcher and reconnect.
Vulkan / DirectX Crash (PC) The graphics API crashed

Cause: A GPU driver problem or an unstable API selection.

Fix:
  1. Update your GPU drivers.
  2. Switch between Vulkan and DirectX 11 in the game settings.
  3. Remove overclocks and verify game files.
2-0x0000D013 Matchmaking/network error — the game cannot complete matchmaking or connect to the match service

Cause: A corrupted Uplay loader DLL, a NAT/connection problem, or a temporary Ubisoft matchmaking-service issue.

Fix:
  1. Delete uplay_r1_loader.dll and uplay_r1_loader64.dll from the game install folder, then verify files in Ubisoft Connect/Steam to re-download them.
  2. Run the game and the launcher as Administrator.
  3. Set NAT to Open (UPnP or port-forward), restart your router, and disable any VPN.
  4. Restart your PC and retry — the error is often server-side during peak or maintenance.
2-0x0000D012 Connectivity error reaching the Ubisoft services (documented on Ubisoft Support)

Cause: A network or NAT problem, or the Ubisoft connectivity services being temporarily unreachable.

Fix:
  1. Check the Rainbow Six / Ubisoft server status before troubleshooting.
  2. Open your NAT type (UPnP or port-forward Siege ports) and disable VPN/proxy.
  3. Restart the router and flush DNS (ipconfig /flushdns).
  4. Verify game files, then restart Ubisoft Connect and the game.
2-0x0000D019 Connection/matchmaking error — session could not reach the servers

Cause: A transient Ubisoft service issue or a local connection interruption during connect/matchmaking.

Fix:
  1. Wait and retry — frequently resolves once the service recovers.
  2. Restart Ubisoft Connect and Rainbow Six Siege.
  3. Use a wired connection and restart the router.
  4. Verify game files if it persists.

Fixes that work for most Rainbow Six Siege errors

  1. Check the game's official server status page or its X/Twitter — if servers are down or under maintenance, no local fix will help; wait it out.
  2. Fully close and restart the game and its launcher (Steam / Epic / EA App / Battle.net / Riot Client).
  3. Restart your router and, on PC, flush DNS (open Command Prompt and run: ipconfig /flushdns).
  4. Verify or repair the game files in your launcher so a corrupted update is re-downloaded.
  5. Make sure the game and your OS are fully updated — most 'version mismatch' errors are an out-of-date client.

FAQ

How do I fix Rainbow Six Siege error 2-0x0000C015?

It means you lost connection to the Ubisoft servers. Check the Rainbow Six/Ubisoft server status, restart the game and Ubisoft Connect, and restart your router — use a wired connection if you can.

What fixes the Vulkan crash in Rainbow Six Siege?

Update your GPU drivers, then switch the graphics API between Vulkan and DirectX 11 in the game settings. Remove any overclock and verify the game files if it keeps crashing.

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