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Failed to Authenticate Connection

A player is kicked with 'Failed to verify username' or 'Failed to authenticate your connection'. The server runs in online mode and could not validate the player's account against Mojang/Microsoft's session servers.

Mit jelent ez a hiba?
In online mode the server checks each login with the official session servers. This failure means that check did not succeed, commonly during an auth outage, or, behind a proxy, when IP forwarding is not configured so the backend cannot verify the player. 
Failed to verify username! / Failed to authenticate your connection
Leggyakoribb okok
  • A temporary Mojang/Microsoft authentication outage.
  • A proxy (BungeeCord/Velocity) without correct IP forwarding to the backend.
  • The backend in online mode while sitting behind a proxy (should be offline + forwarding).
  • A mismatched forwarding secret (modern forwarding / BungeeGuard).
  • A client-side session problem.
Hogyan diagnosztizálj
  1. Check whether everyone is affected (suggests an outage or proxy config) or just one player.
  2. Look at the Mojang/Microsoft status pages.
  3. If using a proxy, verify forwarding mode and secret match on both sides.
  4. Confirm online-mode settings are correct for your topology.
Ajánlott megoldások
  • Wait out an auth outage
    If Mojang/Microsoft auth is down, the fix is to wait, nothing is misconfigured locally.
  • Configure proxy forwarding
    On BungeeCord/Velocity, enable IP forwarding and set the matching secret on each backend.
  • Set online-mode correctly
    Behind a proxy, backends run offline mode with secure forwarding, never plain offline mode exposed publicly.
  • Match the forwarding secret
    Ensure the Velocity modern-forwarding / BungeeGuard secret is identical on proxy and backends.
Naplóm elemzése
Gyakran ismételt kérdések

No, invalid session is a client-side login issue. This is the server failing to verify the account, often a proxy/outage matter.

Without proper IP forwarding, the backend cannot confirm the player's identity, so authentication fails.

Behind a proxy, backends use offline mode with secure forwarding so only the proxy authenticates, never exposed offline directly.