Elden Ring Error Code CO-OP-1: How to Fix It

Medium 15-45 minutes Medium Severity Verified June 2026
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Error Code
co-op-1
Brand
Elden Ring
Product Type
game
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
15-45 minutes
Elden Ring error code CO-OP-1 indicates that your game failed to establish or maintain a multiplayer connection, preventing you from summoning other players or being summoned into their world. This error can appear when attempting co-op play, PvP invasions, or using multiplayer items like the Furlcalling Finger Remedy. It is typically caused by network configuration issues, server problems, firewall restrictions, or mismatched game versions between players.
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Tools You'll Need

How to Fix Error Code co-op-1

  1. Check Elden Ring Server Status

  2. Restart the Game and Your Console or PC

  3. Restart Your Router and Modem

  4. Switch to a Wired (Ethernet) Connection

  5. Enable UPnP or Manually Open Ports on Your Router

    Do not share your router admin credentials with anyone. Only open ports for services you actively use to minimize security exposure.

  6. Set Your NAT Type to Open or Moderate

    Placing a device in the DMZ removes all router-level firewall protection for that device. Only use this method temporarily for testing, and ensure your device's own firewall is active.

  7. Disable VPNs, Proxy Services, and Overlays

  8. Verify Game Files (PC/Steam) or Reinstall the Game

    Back up your save files to cloud storage or an external drive before uninstalling to avoid losing your character progress.

  9. Ensure All Players Are on the Same Game Version

  10. Check and Configure Windows Firewall or Antivirus (PC Only)

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When to Call a Professional

If you have tried all steps above and still receive CO-OP-1 errors, the issue may be beyond your home network. Contact your Internet Service Provider (ISP) if you suspect you are behind carrier-grade NAT (CGNAT), which prevents any port forwarding from working — your ISP may be able to assign you a dedicated public IP. For persistent server-side issues, submit a support ticket to Bandai Namco's customer support at support.bandainamcoent.com, including your platform, region, and a description of the error. If you're on a university or corporate network, contact your network administrator as these networks often block gaming traffic entirely.

Frequently Asked Questions

What does Elden Ring error code CO-OP-1 mean?
CO-OP-1 in Elden Ring means your game failed to connect to another player's session during multiplayer. It is a connection error that can occur when summoning allies, being invaded, or using co-op items. It is most often caused by network configuration issues like strict NAT type, closed ports, or an unstable internet connection.
Why does Elden Ring keep failing to connect to co-op?
Elden Ring uses a peer-to-peer multiplayer system that is sensitive to network conditions. Common reasons for repeated co-op failures include: Strict NAT type on your router, closed or blocked network ports, Wi-Fi instability, VPNs interfering with connections, server outages on FromSoftware's end, or you and your co-op partner running different game versions.
How do I fix NAT type for Elden Ring on PlayStation?
To improve your NAT type on PlayStation for Elden Ring, log into your router's admin panel and enable UPnP (Universal Plug and Play). Then on your PlayStation, go to Settings > Network > Set Up Internet Connection and reconnect to your network. Check Settings > Network > View Connection Status — you want NAT Type 1 (Open) or NAT Type 2 (Moderate). NAT Type 3 (Strict) will cause multiplayer problems. You can also manually forward ports UDP 3074, UDP 3478-3479, and TCP 3478-3480 to your PlayStation's IP address.
Does Elden Ring CO-OP-1 happen because of server maintenance?
Yes, FromSoftware periodically takes Elden Ring's multiplayer servers offline for maintenance, updates, or emergency fixes. During these windows, all players will receive connection errors including CO-OP-1 regardless of their network setup. Always check the official Elden Ring Twitter/X account (@ELDENRING) or a server status site before troubleshooting your own network.
Can I play Elden Ring co-op with someone on a different platform?
No. Elden Ring does not support cross-platform multiplayer. PlayStation players can only connect with other PlayStation players, Xbox players with Xbox players, and PC (Steam) players only with other PC (Steam) players. If you and a friend are on different platforms, co-op is not possible regardless of your network settings.

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