Direct answer

“End of Stream” means a connection ended before the protocol exchange finished. Check the server/proxy log at the exact time rather than assuming it means low bandwidth.

What it means

A stream can close after a server restart, authentication refusal, protocol mismatch, proxy timeout or abrupt network reset. The same client-side message can have different server-side causes.

If you are a player

  • Test with a clean client of the correct version and record whether it fails during login or in-game.
  • If several players disconnect simultaneously, report the exact time and whether the server went offline.

If you run the server

  1. Check backend and proxy logs for the earliest disconnect cause; look for process restarts or exception traces.
  2. Compare account authentication, proxy forwarding and version/loader compatibility only as suggested by the logs.
  3. If only one network is affected, test from a second network without modifying server security.
  4. Reproduce once with packet-manipulating plugins temporarily disabled on an isolated staging server if logs implicate them.

Confirm the fix: Verify at least two consecutive successful logins and sustained play. Avoid blanket workarounds such as disabling authentication.

Important notes

  • Packet exceptions often wrap the real cause. Keep the full nested exception and identify the first plugin/mod/protocol component named in it.

References

Use the documentation for the exact software and release you run. These sources support the settings or diagnostic behavior used in this fix.

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