XX-net/XX-Net · error

https create conn to %s:%d fail

Error message

https create conn to %s:%d fail

What it means

HTTP CONNECT handshake parsed, but proxy_session.create_conn failed to create a tunnel to host:port, so the proxy replies 'HTTP/1.1 500 Fail' and closes.

Source

Thrown at code/default/x_tunnel/local/proxy_handler.py:317

            version = b"HTTP/1.1"
        else:
            xlog.warn("https req line fail:%s", line)
            return

        if command != "ONNECT":
            xlog.warn("https req line fail:%s", line)
            return

        host, _, port = path.rpartition(':')
        host = host.encode()
        port = int(port)

        header_block = self.read_headers()

        sock = self.connection
        conn_id = proxy_session.create_conn(sock, host, port)
        if not conn_id:
            xlog.warn("https create conn to %s:%d fail", host, port)
            sock.send(b'HTTP/1.1 500 Fail\r\n\r\n')
            return

        xlog.info("https %r connect to %s:%d conn:%d", self.client_address, host, port, conn_id)
        try:
            sock.send(b'HTTP/1.1 200 OK\r\n\r\n')
        except:
            xlog.warn("https %r connect to %s:%d conn:%d closed.", self.client_address, host, port, conn_id)

        if (len(self.read_buffer) - self.buffer_start) > 0:
            g.session.conn_list[conn_id].transfer_received_data(self.read_buffer[self.buffer_start:])

        g.session.conn_list[conn_id].start(block=True)

    def http_handler(self, first_char):
        req_line = self.read_crlf_line()
        words = req_line.split()
        if len(words) == 3:

View on GitHub (pinned to cfa5bc17b6)

Solutions

1. Verify x-tunnel login/session is up
2. Check balance and front availability (see errors 223/227)
3. Restart the client if the session is wedged

if not g.session:
    establish_session_first()

When it happens

Trigger: HTTPS browsing while the x-tunnel session is down, not logged in, quota exhausted, or fronts unavailable so create_conn returns nothing.

Common situations: Session expired/never established, missing account config, all fronts blocked.

Related errors

• https req line fail:%s
• https req line fail:%s
• Socks4 connect fail, no conn_id
• socks5 create conn to %s:%d fail
• https %r connect to %s:%d conn:%d closed.

AI-assisted analysis of XX-net/XX-Net@cfa5bc17b6 (2026-08-27). Data as JSON: /api/errors/a4a927dd0a3029ba. Report an issue: GitHub.