XX-net/XX-Net · warning

send_conn_data but not running

Error message

send_conn_data but not running

What it means

send_conn_data is invoked (from create_conn, transfer_received_data, transfer_ack, or transfer_peer_close) with data for a connection, but proxy_session.running is False — the session is stopped or was never successfully started. The upload is dropped with this warning because there is no transport to send on.

Source

Thrown at code/default/x_tunnel/local/proxy_session.py:529

                pass
        # self.conn_list = {}
        xlog.debug("stop all connection finished")

    def remove_conn(self, conn_id):
        try:
            if conn_id in self.conn_list:
                conn = self.conn_list[conn_id]
                # xlog.debug("remove conn:%d %s:%d", conn_id, conn.host, conn.port)
                del self.conn_list[conn_id]
        except Exception as e:
            xlog.warn("remove conn:%d except:%r", conn_id, e)

        if len(self.conn_list) == 0:
            self.target_on_roads = 0

    def send_conn_data(self, conn_id, data):
        if not self.running:
            xlog.warn("send_conn_data but not running")
            return

        # xlog.debug("upload conn:%d, len:%d", conn_id, len(data))
        buf = base_container.WriteBuffer()
        buf.append(struct.pack("<II", conn_id, len(data)))
        buf.append(data)
        self.send_buffer.put(buf)

        if self.oldest_received_time == 0:
            self.oldest_received_time = time.time()
        elif self.send_buffer.pool_size > g.config.max_payload:
            # xlog.debug("notify on send conn data")
            self.wait_queue.notify()

    @staticmethod
    def sn_payload_head(sn, payload):
        return struct.pack("<II", sn, len(payload))

View on GitHub (pinned to cfa5bc17b6)

Solutions

1. Only route client traffic after session.start() succeeds; gate the local proxy listener on session.running.
2. Retry the request after the session is re-established (login succeeds and running is True).
3. During shutdown, close accepted client sockets first so handlers don't attempt uploads on a dead session.

Example fix

# before
sock = listener.accept(); session_conn.send_conn_data(conn_id, data)

# after
if not session.running:
    session.start()
if session.running:
    session.send_conn_data(conn_id, data)

if not proxy_session.running:
    proxy_session.start()
assert proxy_session.running, 'tunnel not running'
proxy_session.send_conn_data(conn_id, data)

def session_active(session) -> bool:
    return bool(getattr(session, 'running', False))

When it happens

Trigger: Any client traffic arriving after session stop() (or after a failed start/login), e.g. an in-flight HTTP proxy request whose upload path runs while the session is shutting down or re-logging-in.

Common situations: Restart/relogin windows where the local proxy still accepts client connections; requests in flight when the tunnel drops; code that starts the proxy listener before verifying session.start() returned True.

Related errors

• body len:%d %s %s
• session try to run but is running.
• stopping conn:%d fail:%r
• check_upload_not_acked found transfer_no:%d upload timeout:%

AI-assisted analysis of XX-net/XX-Net@cfa5bc17b6 (2026-08-27). Data as JSON: /api/errors/c05e23d785048c55. Report an issue: GitHub.