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

Return to Moria Co-op Not Working? Here's the Fix

Return to Moria co-op problems are usually crossplay/NAT or a host that's offline, not a broken save. Fastest fix: make sure host and joiners are on compatible platforms, set NAT to Open, and have the host reload the world before you rejoin.

Exact details for The Lord of the Rings: Return to Moria

Co-op type
Peer-to-peer, host-based (up to 8 players)
Crossplay
Supported storefronts, must be enabled both sides
NAT type
Open on host + joiners
First check
Host is loaded into the world

Error codes

Can't join friend's game The join request never reached the host session

Cause: Crossplay mismatch, strict NAT, or the host isn't in-world.

Fix:
  1. Confirm the host has loaded into the world, not the menu.
  2. Check Steam/Epic crossplay is enabled on both sides.
  3. Set NAT to Open / enable UPnP on both routers.
  4. Add each other as friends on the same platform layer.
Session / connection failed The peer-to-peer session dropped or never established

Cause: P2P routing blocked by NAT or a firewall.

Fix:
  1. Allow the game through Windows Firewall on host and client.
  2. Disable VPN on both machines during co-op.
  3. Host on a wired connection for a stable session.
  4. Retry — P2P sessions sometimes need a second attempt.
World not visible / can't host Friends can't see or reach your hosted world

Cause: Private lobby, wrong invite path, or NAT.

Fix:
  1. Set the session to friends/public rather than private-only.
  2. Invite via the in-game friends list, not just Steam overlay.
  3. Enable UPnP so the host port is reachable.
  4. Restart the session if invites stop arriving.

Fixes that work for most The Lord of the Rings: Return to Moria errors

  1. Confirm the host is loaded into the world first.
  2. Enable Steam/Epic crossplay on both sides.
  3. Set NAT to Open / enable UPnP on both routers.
  4. Allow the game through Windows Firewall.
  5. Disable VPN during co-op.
  6. Host on a wired connection.

FAQ

Why can't I join my friend in Return to Moria?

Usually the host isn't fully in-world, crossplay is off, or NAT is strict. Have the host load the world, enable crossplay on both sides, and set NAT to Open, then retry the invite.

Does Return to Moria have crossplay?

It supports crossplay between supported storefronts, but both players must have crossplay enabled and be reachable through NAT/firewall. Mismatched settings are the most common cause of 'can't join'.

How do I fix Return to Moria co-op session failed?

It's a peer-to-peer session, so allow the game through the firewall, disable VPN, host on wired, and enable UPnP. Then retry — P2P sessions often connect on the second attempt.

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