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[Bug]: Concurrent connections drop existing users (Single-user limitation on a shared connection) #28

@Mr-MPB

Description

@Mr-MPB

I have noticed an issue where multiple clients cannot use the same Slipgate connection simultaneously. When a second user connects to the server (regardless of whether they are using the same user credentials or different ones), the previously connected user gets disconnected or loses internet access. The system behaves as if the tunnel only supports one active client at a time.
Steps to Reproduce:

  1. Set up a Slipgate server and generate a client configuration.
  2. Connect Client A to the server and verify the connection is stable.
  3. Connect Client B to the same server (using the same user config or a different user config on the same connection).
  4. Observe that Client A immediately loses connection or traffic drops, while Client B connects successfully.
    Expected Behavior:
    The server should support multiple concurrent connections, routing traffic independently for each connected client without dropping existing active sessions.
    Environment:
    Server OS: Ubuntu 24.04
    Client OS: Android 16
    Slipgate Version: 2.5.2 armv8 full

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